Document And Entity Information - shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Apr. 27, 2018 |
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| Document Information [Line Items] | ||
| Entity Registrant Name | COHU INC | |
| Entity Central Index Key | 0000021535 | |
| Trading Symbol | cohu | |
| Current Fiscal Year End Date | --12-29 | |
| Entity Filer Category | Accelerated Filer | |
| Entity Current Reporting Status | Yes | |
| Entity Voluntary Filers | No | |
| Entity Well-known Seasoned Issuer | No | |
| Entity Common Stock, Shares Outstanding (in shares) | 28,798,284 | |
| Document Type | 10-Q | |
| Document Period End Date | Mar. 31, 2018 | |
| Document Fiscal Year Focus | 2018 | |
| Document Fiscal Period Focus | Q1 | |
| Amendment Flag | false |
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- Definition If the value is true, then the document is an amendment to previously-filed/accepted document. No definition available.
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- Definition End date of current fiscal year in the format --MM-DD. No definition available.
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- Definition This is focus fiscal period of the document report. For a first quarter 2006 quarterly report, which may also provide financial information from prior periods, the first fiscal quarter should be given as the fiscal period focus. Values: FY, Q1, Q2, Q3, Q4, H1, H2, M9, T1, T2, T3, M8, CY. No definition available.
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- Definition This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. No definition available.
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- Definition The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word "Other". No definition available.
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- Definition A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument. No definition available.
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- Definition Indicate "Yes" or "No" whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure. No definition available.
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- Definition Indicate whether the registrant is one of the following: (1) Large Accelerated Filer, (2) Accelerated Filer, (3) Non-accelerated Filer, (4) Smaller Reporting Company (Non-accelerated) or (5) Smaller Reporting Accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure. No definition available.
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- Definition The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Indicate "Yes" or "No" if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. No definition available.
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- Definition Indicate "Yes" or "No" if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A. No definition available.
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- Definition Trading symbol of an instrument as listed on an exchange. No definition available.
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- Definition The carrying value of deferred revenue, net of expenses, as of the balance sheet date that is expected to be recognized as such within one year or the normal operating cycle, if longer. No definition available.
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- Definition Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer. No definition available.
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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. No definition available.
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date. No definition available.
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition Carrying value as of the balance sheet date of current portion of long-term loans payable to bank due within one year or the operating cycle if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the operating cycle if longer, excluding current portion. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of current assets classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of noncurrent assets classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement that is payable after one year (or beyond the operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of borrowings from a bank classified as other, maturing within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares shares in Thousands |
Mar. 31, 2018 |
Dec. 30, 2017 |
[1] | ||
|---|---|---|---|---|---|
| Preferred stock, par value (in dollars per share) | $ 1 | $ 1 | |||
| Preferred stock, shares authorized (in shares) | 1,000 | 1,000 | |||
| Preferred stock, shares issued (in shares) | 0 | 0 | |||
| Common stock, par value (in dollars per share) | $ 1 | $ 1 | |||
| Common stock, shares authorized (in shares) | 60,000 | 60,000 | |||
| Common stock, shares issued (in shares) | 28,796 | 28,489 | |||
| Common stock, shares outstanding (in shares) | 28,796 | 28,489 | |||
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- Definition Face amount or stated value per share of common stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 25, 2017 |
|
| Net sales | $ 95,150 | $ 81,097 |
| Cost and expenses: | ||
| Cost of sales | 55,599 | 48,841 |
| Research and development | 11,775 | 9,776 |
| Selling, general and administrative | 17,763 | 14,460 |
| 85,137 | 73,077 | |
| Income from operations | 10,013 | 8,020 |
| Interest income | 236 | 101 |
| Income from continuing operations before taxes | 10,249 | 8,121 |
| Income tax provision | 2,127 | 1,358 |
| Income from continuing operations | 8,122 | 6,763 |
| Income from discontinued operations | ||
| Net income | $ 8,122 | $ 6,763 |
| Basic: | ||
| Income from continuing operations (in dollars per share) | $ 0.28 | $ 0.25 |
| Income from discontinued operations (in dollars per share) | ||
| Net income (in dollars per share) | 0.28 | 0.25 |
| Diluted: | ||
| Income from continuing operations (in dollars per share) | 0.28 | 0.24 |
| Income from discontinued operations (in dollars per share) | ||
| Net income (in dollars per share) | $ 0.28 | $ 0.24 |
| Weighted average shares used in computing income per share: | ||
| Basic (in shares) | 28,602 | 26,978 |
| Diluted (in shares) | 29,531 | 28,252 |
| Cash dividends declared per share (in dollars per share) | $ 0.06 | $ 0.06 |
| X | ||||||||||
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Total costs of sales and operating expenses for the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References No definition available.
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| X | ||||||||||
- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). No definition available.
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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
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| X | ||||||||||
- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 25, 2017 |
|
| Net income | $ 8,122 | $ 6,763 |
| Other comprehensive income, net of tax: | ||
| Foreign currency translation adjustments | 3,854 | 4,046 |
| Adjustments related to postretirement benefits | (73) | (69) |
| Change in unrealized gain/loss on investments | (10) | 1 |
| Other comprehensive income, net of tax | 3,771 | 3,978 |
| Comprehensive income | $ 11,893 | $ 10,741 |
| X | ||||||||||
- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands |
3 Months Ended | |||||
|---|---|---|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2018 |
Mar. 25, 2017 |
||||
| Cash flows from operating activities: | ||||||
| Net income | $ 8,122 | $ 8,122 | $ 6,763 | |||
| Adjustments to reconcile net income to net cash used in operating activities: | ||||||
| Depreciation and amortization | 2,457 | 2,202 | ||||
| Share-based compensation expense | 1,669 | 1,717 | ||||
| Deferred income taxes | 506 | (711) | ||||
| Adjustment to contingent consideration liability | (147) | |||||
| Changes in other accrued liabilities | (762) | 135 | ||||
| Changes in other assets | 265 | (433) | ||||
| Changes in current assets and liabilities, excluding effects from acquisitions: | ||||||
| Accounts receivable | (13,152) | (15,780) | ||||
| Inventories | (338) | (4,730) | ||||
| Accounts payable | 2,920 | 5,445 | ||||
| Other current assets | (1,242) | (1,422) | ||||
| Income taxes payable | (861) | 690 | ||||
| Deferred profit | (2,465) | (2,121) | ||||
| Accrued compensation, warranty and other liabilities | (6,249) | 1,043 | ||||
| Net cash used in operating activities | (9,277) | (7,202) | ||||
| Cash flows from investing activities, excluding effects from acquisitions: | ||||||
| Purchases of short-term investments | (18,801) | (8,080) | ||||
| Sales and maturities of short-term investments | 15,536 | 17,701 | ||||
| Cash paid for Kita, net of cash received | (11,716) | |||||
| Purchases of property, plant and equipment | (1,074) | (1,430) | ||||
| Cash received from sale of fixed assets | 20 | |||||
| Net cash used in investing activities | (4,319) | (3,525) | ||||
| Cash flows from financing activities: | ||||||
| Repurchases of common stock, net | (3,577) | (957) | ||||
| Cash dividends paid | (1,772) | (1,606) | ||||
| Payment of contingent consideration for Kita | (823) | |||||
| Repayments of long-term debt | (355) | (470) | ||||
| Net cash used in financing activities | (6,527) | (3,033) | ||||
| Effect of exchange rate changes on cash and cash equivalents | 973 | 1,551 | ||||
| Net decrease in cash and cash equivalents | (19,150) | (12,209) | ||||
| Cash and cash equivalents at beginning of period | 134,286 | [1] | 96,045 | |||
| Cash and cash equivalents at end of period | 115,136 | 115,136 | 83,836 | |||
| Supplemental disclosure of cash flow information: | ||||||
| Cash paid for income taxes | 2,498 | 2,312 | ||||
| Inventory capitalized as property, plant and equipment | 84 | 42 | ||||
| Dividends declared but not yet paid | 1,713 | $ 1,713 | 1,614 | |||
| Property, plant and equipment purchases included in accounts payable | $ 247 | $ 56 | ||||
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- Definition Represents information about inventory capitalized as property, plant and equipment. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. No definition available.
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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The increase (decrease) during the reporting period, excluding the portion taken into income, in the liability reflecting revenue yet to be earned for which cash or other forms of consideration was received or recorded as a receivable. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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- Definition The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition The increase (decrease) during the reporting period in other expenses incurred but not yet paid. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of increase (decrease) in noncurrent assets classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of increase (decrease) in operating assets classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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| X | ||||||||||
- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The net cash inflow or outflow resulting from the entity's share transaction. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Aggregate cash proceeds received from a combination of transactions that are classified as investing activities in which assets, which may include one or more investments, are sold to third-party buyers. This element can be used by entities to aggregate proceeds from all asset sales that are classified as investing activities. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The cash outflow to settle a bank borrowing during the year. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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Note 1 - Summary of Significant Accounting Policies |
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Mar. 31, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes to Financial Statements | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Significant Accounting Policies [Text Block] |
Basis of Presentation Our fiscal years are based on a 52 - or 53 -week period ending on the last Saturday in December. The condensed consolidated balance sheet at December 30, 2017, has been derived from our audited financial statements at that date. The interim condensed consolidated financial statements as of March 31, 2018, ( also referred to as “the first quarter of fiscal 2018” and “the first three months of fiscal 2018” ) and March 25, 2017, ( also referred to as “the first quarter of fiscal 2017” and “the first three months of fiscal 2017” ) are unaudited. However, in management’s opinion, these financial statements reflect all adjustments (consisting only of normal, recurring items) necessary to provide a fair presentation of our financial position, results of operations and cash flows for the periods presented. The first quarter of fiscal 2018 was comprised of 13 weeks and 2017 was comprised of 12 weeks.Our interim results are not necessarily indicative of the results that should be expected for the full year. For a better understanding of Cohu, Inc. and our financial statements, we recommend reading these interim condensed consolidated financial statements in conjunction with our audited financial statements for the year ended December 30, 2017, which are included in our 2017 Annual Report on Form 10 -K, filed with the U. S. Securities and Exchange Commission (“SEC”). In the following notes to our interim condensed consolidated financial statements, Cohu, Inc. is referred to as “Cohu”, “we”, “our” and “us”.Concentration of Credit Risk Financial instruments that potentially subject us to significant credit risk consist principally of cash equivalents, short-term investments and trade accounts receivable. We invest in a variety of financial instruments and, by policy, limit the amount of credit exposure with any one issuer.Trade accounts receivable are presented net of allowance for doubtful accounts of $0.2 March 31, 2018 and December 30, 2017. Our customers include semiconductor manufacturers and semiconductor test subcontractors and other customers located throughout many areas of the world. While we believe that our allowance for doubtful accounts is adequate and represents our best estimate at March 31, 2018, we will continue to monitor customer liquidity and other economic conditions, which may result in changes to our estimates regarding collectability.Inventories Inventories are stated at the lower of cost, determined on a first -in, first -out basis, or net realizable value. Cost includes labor, material and overhead costs. Determining net realizable value of inventories involves numerous estimates and judgments including projecting average selling prices and sales volumes for future periods and costs to complete and dispose of inventory. As a result of these analyses, we record a charge to cost of sales in advance of the period when the inventory is sold when estimated net realizable values are below our costs.Inventories by category were as follows ( in thousands ):
Property, Plant and Equipment Depreciation and amortization of property, plant and equipment is calculated principally on the straight-line method based on estimated useful lives of thirty to forty years for buildings, five to fifteen years for building improvements and three to ten years for machinery, equipment and software. Land is not depreciated.Property, plant and equipment, at cost, consisted of the following (in thousands) :
Segment Information We applied the provisions of ASC Topic 280, Segment Reporting , (“ASC 280” ), which sets forth a management approach to segment reporting and establishes requirements to report selected segment information quarterly and to report annually entity-wide disclosures about products, major customers and the geographies in which the entity holds material assets and reports revenue. An operating segment is defined as a component that engages in business activities whose operating results are reviewed by the chief operating decision maker and for which discrete financial information is available. Based on the provisions of ASC 280, we have determined that our identified operating segments, which are Digital Test Handlers (DTH), Analog Test Handlers (ATH) and Integrated Test Solutions (ITS), qualify for aggregation under ASC 280 due to similarities in their customers, their economic characteristics, and the nature of products and services provided. As a result, we report in one segment, semiconductor equipment.Goodwill, Other Intangible Assets and Long-lived Assets We evaluate goodwill for impairment annually and when an event occurs or circumstances change that indicate that the carrying value may not be recoverable. We test goodwill for impairment by first comparing the book value of net assets to the fair value of the reporting units. If the fair value is determined to be less than the book value, a second step is performed to compute the amount of impairment as the difference between the estimated fair value of goodwill and the carrying value. We estimated the fair values of our reporting units primarily using the income approach valuation methodology that includes the discounted cash flow method, taking into consideration the market approach and certain market multiples as a validation of the values derived using the discounted cash flow methodology. Forecasts of future cash flows are based on our best estimate of future net sales and operating expenses, based primarily on customer forecasts, industry trade organization data and general economic conditions.We conduct our annual impairment test as of October 1st of each year, and have determined there was no impairment as of October 1, 2017, as we determined that the estimated fair values of our reporting units exceeded their carrying values on that date. Other events and changes in circumstances may also require goodwill to be tested for impairment between annual measurement dates. As of March 31, 2018, we do not believe there have been any events or circumstances that would require us to perform an interim goodwill impairment review. In the event we determine that an interim goodwill impairment review is required, in a future period, the review may result in an impairment charge, which would have a negative impact on our results of operations.Long-lived assets, other than goodwill, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets might not be recoverable. Conditions that would necessitate an impairment assessment include a significant decline in the observable market value of an asset, a significant change in the extent or manner in which an asset is used, or any other significant adverse change that would indicate that the carrying amount of an asset or group of assets may not be recoverable. For long-lived assets, impairment losses are only recorded if the asset’s carrying amount is not recoverable through its undiscounted, probability-weighted future cash flows. We measure the impairment loss based on the difference between the carrying amount and estimated fair value.Foreign Remeasurement and Currency Translation Assets and liabilities of our wholly owned foreign subsidiaries that use the U.S. Dollar as their functional currency are re-measured using exchange rates in effect at the end of the period, except for nonmonetary assets, such as inventories and property, plant and equipment, which are re-measured using historical exchange rates. Revenues and costs are re-measured using average exchange rates for the period, except for costs related to those balance sheet items that are re-measured using historical exchange rates. Gains and losses on foreign currency transactions are recognized as incurred. Certain of our foreign subsidiaries have designated the local currency as their functional currency and, as a result, their assets and liabilities are translated at the rate of exchange at the balance sheet date, while revenue and expenses are translated using the average exchange rate for the period. During the three months ended March 31, 2018, and March 25, 2017, we recognized foreign exchange losses of $1.6 million and $1.3 million, respectively, in our consolidated income statements. Cumulative translation adjustments resulting from the translation of the financial statements are included as a separate component of stockholders’ equity.Share-Based Compensation We measure and recognize all share-based compensation under the fair value method. Our estimate of share-based compensation expense requires a number of complex and subjective assumptions including our stock price volatility, employee exercise patterns (expected life of the options) and related tax effects. The assumptions used in calculating the fair value of share-based awards represent our best estimates, but these estimates involve inherent uncertainties and the application of management judgment. Although we believe the assumptions and estimates we have made are reasonable and appropriate, changes in assumptions could materially impact our reported financial results. Reported share-based compensation is classified, in the condensed consolidated interim financial statements, as follows (in thousands) :
Income Per Share Basic income per common share is computed by dividing net income by the weighted-average number of common shares outstanding during the reporting period. Diluted income per share includes the dilutive effect of common shares potentially issuable upon the exercise of stock options, vesting of outstanding restricted stock and performance stock units and issuance of stock under our employee stock purchase plan using the treasury stock method. In loss periods, potentially dilutive securities are excluded from the per share computations due to their anti-dilutive effect. For purposes of computing diluted income per share, stock options with exercise prices that exceed the average fair market value of our common stock for the period are excluded. For the three months ended March 31, 2018, approximately 34,000 shares of common stock were excluded from the computation. For the three months ended March 25, 2017, approximately 258,000 shares of common stock were excluded from the computation.The following table reconciles the denominators used in computing basic and diluted income per share (in thousands) :
Adoption of New Revenue Accounting Standard We adopted Accounting Standards Codification (ASC) Topic 606, Revenue from Contracts with Customers (“ASC 606” ), on December 31, 2017, the first day of our 2018 fiscal year. We elected to implement the new standard using the modified retrospective method of adoption which only applies to those contracts which were not completed as of December 31, 2017. Revenues for the quarter ended March 31, 2018, have been accounted for using ASC 606 and the prior year period ended March 25, 2017, has not been adjusted. Upon adoption of ASC 606, we recorded a cumulative-effect adjustment to retained earnings of $1.1 million on December 31, 2017, which represents the impact of ASC 606 on our deferred revenue.Material changes recorded in connection with the cumulative-effect adjustment were as follows ( in thousands ):
The adoption of ASC 606 had no impact to cash used in net operating, investing or financing activities in our condensed consolidated statements of cash flows. The following table presents the amounts by which financial statement line items included in our condensed consolidated statements of income for the three months ended March 31, 2018 and our condensed consolidated balance sheet at March 31, 2018 were materially affected due to the adoption of ASC 606 (in thousands):
* Balance sheet line items include the cumulative-effect adjustment recorded on December 31, 2017. Under ASC 606 our revenue will continue to be recognized at a point in time when all revenue criteria have been met and transfer of control has occurred, typically, this occurs upon shipment of products to our customers. In certain instances, when customer payment terms provide that a minority portion of the equipment purchase price be paid only upon customer acceptance, recognition of revenue may occur sooner under ASC 606. Revenue Recognition Our net sales are derived from the sale of products and services and are adjusted for estimated returns and allowances, which historically have been insignificant. We recognize revenue when the obligations under the terms of a contract with our customers are satisfied; generally, this occurs with the transfer of control of our systems, non-system products or services. In circumstances where control is not transferred until destination or acceptance, we defer revenue recognition until such events occur. Revenue for established products that have previously satisfied a customer’s acceptance requirements is generally recognized upon shipment. In cases where a prior history of customer acceptance cannot be demonstrated or from sales where customer payment dates are not determinable and in the case of new products, revenue and cost of sales are deferred until customer acceptance has been received. Our post-shipment obligations typically include installation and standard warranties. The estimated fair value of installation related revenue is recognized in the period the installation is performed. Service revenue is recognized over time as the transfer of control is completed for the related contract or upon completion of the services if they are short-term in nature. Spares, contactor and kit revenue is generally recognized upon shipment.Certain of our equipment sales have multiple performance obligations. These arrangements involve the delivery or performance of multiple performance obligations, and transfer of control of performance obligations may occur at different points in time or over different periods of time. For arrangements containing multiple performance obligations, the revenue relating to the undelivered performance obligation is deferred using the relative standalone selling price method utilizing estimated sales prices until satisfaction of the deferred performance obligation.Unsatisfied performance obligations primarily represent contracts for products with future delivery dates and with an original expected duration of one year or less. As allowed under ASC 606, we have opted to not disclose unsatisfied performance obligations as these contracts have original expected durations of less than one year.We generally sell our equipment with a product warranty. The product warranty provides assurance to customers that delivered products are as specified in the contract (an “assurance-type warranty”). Therefore, we account for such product warranties under ASC 460, Guarantees (ASC 460 ), and not as a separate performance obligation.The transaction price reflects our expectations about the consideration we will be entitled to receive from the customer and may include fixed or variable amounts. Fixed consideration primarily includes sales to customers that are known as of the end of the reporting period. Variable consideration includes sales in which the amount of consideration that we will receive is unknown as of the end of a reporting period. Such consideration primarily includes sales made to certain customers with cumulative tier volume discounts offered. Variable consideration arrangements are rare; however, when they occur, we estimate variable consideration as the expected value to which we expect to be entitled. Included in the transaction price estimate are amounts in which it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. The estimate is based on information available for projected future sales. Variable consideration that does not meet revenue recognition criteria is deferred. Our contracts are typically less than one year in duration and we have elected to use the practical expedient available in ASC 606 to expense cost to obtain contracts as they are incurred because they would be amortized over less than one year. Accounts receivable represents our unconditional right to receive consideration from our customer. Payments terms do not exceed one year from the invoice date and therefore do not include a significant financing component. To date, there have been no material impairment losses on accounts receivable. There were no material contract assets or contract liabilities recorded on the condensed consolidated balance sheet in any of the periods presented.On shipments where sales are not recognized, gross profit is generally recorded as deferred profit in our consolidated balance sheet representing the difference between the receivable recorded and the inventory shipped. At March 31, 2018, we had deferred revenue totaling approximately $5.9 million, current deferred profit of $2.9 million and deferred profit expected to be recognized after one year included in noncurrent other accrued liabilities of $0.8 million. At December 30, 2017, we had deferred revenue totaling approximately $10.4 million, current deferred profit of $6.6 million and deferred profit expected to be recognized after one year included in noncurrent other accrued liabilities of $0.8 million. Our balances at March 31, 2018, include a $1.1 million beginning retained earnings adjustment as result of our adoption of ASC 606 on the first day of fiscal 2018.The periodic change is primarily a result of increases and decreases in deferrals of revenue associated with product shipments made to our customers in accordance with our revenue recognition policy.Net sales by type are as follows (in thousands):
Revenue by geographic area based upon product shipment destination (in thousands ):
A small number of customers historically have been responsible for a significant portion of our net sales. Significant customer concentration information is as follows:
Accumulated Other Comprehensive Loss Our accumulated other comprehensive loss balance totaled approximately $14.0 million and $17.8 million at March 31, 2018 and December 30, 2017, respectively, and was attributed to all non-owner changes in stockholders’ equity and consists of, on an after-tax basis where applicable, foreign currency adjustments resulting from the translation of certain of our subsidiary accounts where the functional currency is not the U.S. Dollar and adjustments related to postretirement benefits. Reclassification adjustments from accumulated other comprehensive loss during the first three months of fiscal 2018 and 2017 were not significant.Retiree Medical Benefits We provide post-retirement health benefits to certain executives and directors under a noncontributory plan. The net periodic benefit cost incurred during the first three months of fiscal 2018 and 2017 was not significant.Discontinued Operations In 2015, we sold all of the outstanding stock of our mobile microwave communication equipment segment, Broadcast Microwave Services (BMS), for $4.9 million in cash and up to $2.5 million of contingent cash consideration. Our decision to sell this non-core business resulted from management’s determination that they were no longer a strategic fit within our organization.As part of the divestiture of BMS we recorded a contingent consideration receivable that was classified as Level 3 in the fair value hierarchy. See Note 3, “Financial Instruments Measured at Fair Value” for additional information on the three -tier fair value hierarchy. The contingent consideration represented the estimated fair value of future payments we are due based on BMS achieving annual revenue targets in 2016 and 2017 as specified in the sale agreement. We determined the value of the contingent consideration using a Monte Carlo simulation model with changes to the fair value of the contingent consideration being recognized in discontinued operations. During 2017, BMS failed to meet the necessary revenue targets and the contingent consideration receivable was written-off. Unless otherwise indicated, all amounts herein relate to continuing operations.Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements In March 2017, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2017 -07 , Compensation – Retirement Benefits (Topic which provides additional guidance on the presentation of net periodic pension and postretirement benefit costs in the income statement and on the components eligible for capitalization. The amendments in this guidance require that an employer report the service cost component of the net periodic benefit costs in the same income statement line item as other compensation costs arising from services rendered by employees during the period. The non-service-cost components of net periodic benefit costs are to be presented in the income statement separately from the service cost components and outside a subtotal of income from operations. The guidance also allows for the capitalization of the service cost components, when applicable (i.e., as a cost of internally manufactured inventory or a self-constructed asset). The guidance is effective for annual periods beginning after 715 ) – Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, December 15, 2017, including interim periods within those annual periods; early adoption is permitted as of the beginning of an annual period for which financial statements (interim or annual) have not been issued or made available for issuance. The amendments in this guidance are to be applied retrospectively. The adoption of ASU 2017 -07 did not have a material impact on our condensed consolidated financial statements.In January 2017, the FASB issued ASU No. 2017 -01, Clarifying the Definition of a Business . It revises the definition of a business and provides a framework to evaluate when an input and a substantive process are present in an acquisition to be considered a business. This guidance is effective for annual periods beginning after December 15, 2017. The adoption of ASU 2017 -01 did not have a material impact on our condensed consolidated financial statements.In November 2016, the FASB issued ASU No. 2016 -18, Restricted Cash . It requires that amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017. The adoption of ASU 2016 -18 did not have a material impact on our condensed consolidated financial statements.In October 2016, the FASB issued ASU 2016 -16, Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory. ASU 2016 -16 changes the timing of income tax recognition for an intercompany sale of assets excluding inventory. ASU 2016 -16 requires the seller’s tax effects and the buyer’s deferred taxes to be recognized immediately upon the sale instead of deferring accounting for the income tax implications until the assets are sold to a third party or recovered through use. ASU 2016 -16 is effective for fiscal years beginning after December 15, 2017 including interim periods within the year of adoption. The adoption of ASU 2016 -16 did not have a material impact on our condensed consolidated financial statements.In August 2016, the FASB issued ASU No. 2016 -15 , Classification of Certain Cash Receipts and Cash Payments. It provides guidance on eight specific cash flow issues with the objective of reducing the existing diversity in practice in how they are classified in the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted, provided that all of the amendments are adopted in the same period. The adoption of ASU 2016 -15 did not have a material impact on our condensed consolidated financial statements.Recently Issued Accounting Pronouncements In February 2018, the FASB issued ASU 2018 -02, Income Statement-Reporting Comprehensive Income to give companies the option to reclassify the income tax effects on items within accumulated other comprehensive income resulting from U.S. tax reform to retained earnings. ASU 2018 -02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted. We are currently assessing and have not yet determined the impact ASU 2018 -02 may have on our consolidated financial statements.In January 2017, the FASB issued ASU No. 2017 -04, Simplifying the Test for Goodwill Impairment . It eliminates Step 2 from the goodwill impairment test and requires an entity to recognize an impairment charge for the amount by which the carrying amount of goodwill exceeds the reporting unit's fair value, not to exceed the carrying amount of goodwill. This guidance is effective for annual and any interim impairment tests in fiscal years beginning after December 15, 2019. We do not expect this guidance to have any impact on our consolidated financial statements.In February 2016, the FASB issued ASU No. 2016 -02, Leases (Topic Under this guidance, lessees will be required to recognize a right-of-use asset and a lease liability for all operating leases defined under previous GAAP. This guidance is effective for interim and annual reporting periods beginning after 842 ). December 15, 2018. The new guidance must be adopted using a modified retrospective transition, and provides for certain practical expedients. We are still completing our analysis on the impact this guidance will have on our consolidated financial statements and related disclosures, but recognizing the lease liabilities and related right-of-use assets will have a material impact on our balance sheet. |
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- Definition The entire disclosure for all significant accounting policies of the reporting entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| Business Combination Disclosure [Text Block] |
Kita On January 4, 2017, we completed the acquisition of all the outstanding share capital of Kita Manufacturing Co., LTD. and Kita USA, Inc. (together “Kita”) (the “Acquisition”). Kita, headquartered in Osaka, Japan, and with operations in Attleboro, Massachusetts and Kyoto, Japan, designs, manufactures and sells spring probe contacts used in final test contactors, probe cards, PCB test boards and connectors sold to customers worldwide. The acquisition of Kita was a strategic transaction to expand our total available market, extend our market leadership and broaden our product offerings. In connection with the Acquisition we incurred acquisition related costs, which were expensed to selling, general and administrative that totaled $0.2 million during the three months ended March 25, 2017. No acquisition related costs were incurred during the three months ended March 31, 2018. The Acquisition has been accounted for in conformity with FASB Accounting Standards Codification 805, Business Combinations . The purchase price for Kita was funded primarily by cash reserves and consisted of the following (in thousands ):
The contingent consideration represents the estimated fair value of future payments totaling up to $3.0 2017 and 2018 as specified in the purchase agreement for the Acquisition. The fair value of the contingent consideration recognized on the acquisition date and at March 31, 2018 was estimated by using the Monte Carlo simulation model. Adjustments to the fair value of contingent consideration are reflected in selling, general, and administrative expense in our condensed consolidated statements of income. The contingent consideration payable has been classified as level 3 in the fair value hierarchy. See Note 3 “Financial Instruments Measured at Fair Value” for additional information on the three -tier fair value hierarchy. The fair value of the contingent consideration is recorded in our condensed consolidated balance sheets in current other accrued liabilities.The following table presents the fair value of contingent consideration from the date of acquisition through March 31, 2018 ( in thousands ):
The Acquisition was nontaxable to Cohu and certain of the assets acquired, including goodwill and intangibles, will not be deductible for tax purposes. The acquired assets and liabilities of Kita were recorded at their respective fair values including an amount for goodwill which represented the difference between the Acquisition consideration and the fair value of the identifiable net assets and was allocated to our ITS operating segment.Goodwill and Intangible Assets Changes in the carrying value of goodwill during the year ended December 30, 2017, and the three -month, period ended March 31, 2018 were as follows (in thousands ):
Purchased intangible assets, subject to amortization are as follows ( in thousands ):
Amortization expense related to intangible assets in the first quarter of fiscal 2018 and 2017 was $ million in both periods. Changes in the carrying values of these intangible assets are a result of the impact of fluctuations in currency exchange rates.1.1 |
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- Definition The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] |
Our cash, cash equivalents, and short-term investments consisted primarily of cash and other investment grade securities. We do not hold investment securities for trading purposes. All short-term investments are classified as available-for-sale and recorded at fair value. Investment securities are exposed to market risk due to changes in interest rates and credit risk and we monitor credit risk and attempt to mitigate exposure by making high-quality investments and through investment diversification.Gains and losses on investments are calculated using the specific-identification method and are recognized during the period in which the investment is sold or when an investment experiences an other-than-temporary decline in value. Factors that could indicate an impairment exists include, but are not limited to: earnings performance, changes in credit rating or adverse changes in the regulatory or economic environment of the asset. Gross realized gains and losses on sales of short-term investments are included in interest income. Realized gains and losses for the periods presented were not significant.Investments that we have classified as short-term, by security type, are as follows ( in thousands ) :
Effective maturities of short-term investments are as follows (in thousands) :
Accounting standards pertaining to fair value measurements establish a three -tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. When available, we use quoted market prices to determine the fair value of our investments, and they are included in Level 1. When quoted market prices are unobservable, we use quotes from independent pricing vendors based on recent trading activity and other relevant information, and they are included in Level 2. The following table summarizes, by major security type, our financial instruments that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands) :
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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Note 4 - Employee Stock Benefit Plans |
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| Notes to Financial Statements | |||
| Disclosure of Compensation Related Costs, Share-based Payments [Text Block] |
Our 2005 Equity Incentive Plan (the “2005 Plan”) is a broad-based, long-term retention program intended to attract, motivate, and retain talented employees as well as align stockholder and employee interests. Awards that may be granted under the program include, but are not limited to, non-qualified and incentive stock options, restricted stock units, and performance stock units. We settle employee stock option exercises, employee stock purchase plan purchases, and the vesting of restricted stock units, and performance stock units with newly issued common shares. At March 31, 2018, there were 1,215,372 shares available for future equity grants under the 2005 Equity Incentive Plan.Stock Options Stock options may be granted to employees, consultants and directors to purchase a fixed number of shares of our common stock. The exercise prices of options granted are at least equal to the fair market value of our common stock on the dates of grant and options vest and become exercisable in annual increments that range from one to four years from the date of grant. Stock options granted under the 2015 Plan have a maximum contractual term of ten years. In the first three months of fiscal 2018 we did not grant any stock options and we issued 19,000 shares of our common stock on the exercise of options that were granted previously.At March 31, 2018, we had 453,226 stock options exercisable and outstanding. These options had a weighted-average exercise price of $10.18 per share, an aggregate intrinsic value of approximately $5.7 million and the weighted average remaining contractual term was approximately 4.2 years.Restricted Stock Units We grant restricted stock units (“RSUs”) to certain employees, consultants and directors. RSUs vest in annual increments that range from one to four years from the date of grant. Prior to vesting, RSUs do not have dividend equivalent rights, do not have voting rights and the shares underlying the RSUs are not considered issued and outstanding. New shares of our common stock will be issued on the date the RSUs vest net of the minimum statutory tax withholding requirements to be paid by us on behalf of our employees. As a result, the actual number of shares issued will be fewer than the actual number of RSUs outstanding at March 31, 2018. In the first three months of fiscal 2018 we awarded 250,342 RSUs and we issued 409,215 shares of our common stock on vesting of previously granted awards. At March 31, 2018, we had 812,639 RSUs outstanding with an aggregate intrinsic value of approximately $18.5 million and the weighted average remaining vesting period was approximately 1.7 years.Performance Stock Units We also grant performance stock units (“PSUs”) to senior executives as a part of our long-term equity compensation program. The number of shares of common stock that will ultimately be issued to settle PSUs granted in 2018, 2017 and 2016 ranges from 25% to 200% of the number granted and is determined based on certain performance criteria over a three -year measurement period. For PSUs granted in 2015, the number of shares of common stock issued to settle PSUs granted is determined based on a two -year measurement period. The performance criteria for the PSUs are based on a combination of our annualized Total Shareholder Return (“TSR”) for the performance period and the relative performance of our TSR compared with the annualized TSR of certain peer companies for the performance period. PSUs granted in 2018, 2017 and 2016 vest 100% on the third anniversary of their grant and PSUs granted in 2015 vest 50% on the second and third anniversary of their grant, respectively.We estimated the fair value of the PSUs using a Monte Carlo simulation model on the date of grant. Compensation expense is recognized ratably over the derived service period. New shares of our common stock will be issued on the date the PSUs vest net of the minimum statutory tax withholding requirements to be paid by us on behalf of our employees. As a result, the actual number of shares issued will be fewer than the actual number outstanding at March 31, 2018. In the three months of fiscal 2018, we awarded 88,418 PSUs and we issued 39,174 shares of our common stock on vesting of previously granted awards. At March 31, 2018, we had 343,771 PSUs outstanding with an aggregate intrinsic value of approximately $7.8 million and the weighted average remaining vesting period was approximately 1.8 years.Employee Stock Purchase Plan The Cohu, Inc. 1997 Employee Stock Purchase Plan (“the Plan”) provides for the issuance of shares of our common stock. Under the Plan, eligible employees may purchase shares of Cohu common stock through payroll deductions at a price equal to 85 percent of the lower of the fair market value of Cohu common stock at the beginning or end of each 6 -month purchase period, subject to certain limits. During the first three months of fiscal 2018, no shares of our common stock were sold to our employees under the Plan leaving 601,340 shares available for future issuance. |
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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Note 5 - Income Taxes |
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We used the estimated effective tax rate (“ETR”) expected to be applicable for the full fiscal year in computing our interim tax provisions. The ETR on income from continuing operations for the three months ended March 31, 2018 and March 25, 2017 was 20.8% and 16.7%, respectively. The tax provision in 2018 and 2017 differs from the U.S. federal statutory rate primarily due to the lack of a provision (benefit) on our domestic income (losses) as a result of our valuation allowance on deferred tax assets, foreign income taxed at different rates, changes in our deferred tax asset valuation allowance, state taxes and interest related to unrecognized tax benefits.We have not adjusted our provisional tax estimates related to the U.S. Tax Cuts and Jobs Act (“Tax Act”) that we recorded in the fourth quarter of 2017. Our accounting remains incomplete as of March 31, 2018 and will be refined and, if necessary, adjusted throughout 2018 as required by SEC Staff Accounting Bulletin No. 118 (“SAB 118” ) based on our ongoing analysis of data and tax positions along with new guidance from regulators and interpretation of the law.Due to the complexity of the Tax Act’s global intangible low-taxed income (“GILTI”) tax rules, we are continuing to evaluate this provision and the application of ASC 740. Under GAAP, we are allowed to make an accounting policy election to either (i) treat taxes due on future U.S. inclusions in taxable income related to GILTI as a current-period expense when incurred or (ii) factor such amounts into a company’s measurement of its deferred taxes. We have not yet decided on an accounting policy with respect to the new GILTI tax rules. Our net tax provision for the quarter ended March 31, 2018 did not include any incremental amount of GILTI tax as we expect to utilize existing net operating losses, that have a full valuation allowance, to offset the impact of the GILTI inclusion.Other than for foreign currency exchange rate changes and the Kita acquisition, there was no material change to our unrecognized tax benefits and related accrued interest and penalties during the three -month periods ended March 31, 2018 and March 25, 2017. |
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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Note 6 - Contingencies |
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From time-to-time we are involved in various legal proceedings, examinations by various tax authorities and claims that have arisen in the ordinary course of our business. The outcome of any litigation is inherently uncertain. While there can be no assurance, we do not believe at the present time that the resolution of these matters will have a material adverse effect on our assets, financial position or results of operations. |
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- Definition The entire disclosure for loss and gain contingencies. Describes any existing condition, situation, or set of circumstances involving uncertainty as of the balance sheet date (or prior to issuance of the financial statements) as to a probable or reasonably possible loss incurred by an entity that will ultimately be resolved when one or more future events occur or fail to occur, and typically discloses the amount of loss recorded or a range of possible loss, or an assertion that no reasonable estimate can be made. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Note 7 - Guarantees and Other Obligations |
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| Commitments Contingencies and Guarantees [Text Block] |
Product Warranty Our products are generally sold with warranty periods that range from 12 to 36 months following sale or acceptance. The product warranty promises customers that delivered products are as specified in the contract (an “assurance-type warranty”). Therefore, we accounts for such product warranties under ASC 460, and not as a separate performance obligation. Parts and labor are covered under the terms of the warranty agreement. The warranty provision is based on historical and projected experience by product and configuration.Changes in accrued warranty were as follows ( in thousands ):
Accrued warranty amounts expected to be incurred after one year are included in noncurrent other accrued liabilities in the condensed consolidated balance sheet. These amounts total $0.3 million at March 31, 2018, and $0.6 million at December 30, 2017. Borrowings Revolving Lines of Credit We have credit agreements with multiple financial institutions in Japan under which they administer lines of credit on behalf of our wholly owned Kita subsidiary. The credit facilities renew monthly and provide Kita with access to working capital totaling up to $6.6 million and at March 31, 2018, total borrowings outstanding under the revolving lines of credit were $3.3 million. As these credit facility agreements renew monthly, they have been included in short-term borrowings in our condensed consolidated balance sheet. The revolving lines of credit are denominated in Japanese Yen and, as a result, amounts disclosed herein will fluctuate because of changes in currency exchange rates.Term Loans We have long-term term loans from a series of Japanese financial institutions related to the expansion of Kita’s facility in Osaka, Japan. The loans are collateralized by the facility and land, carry interest rates ranging from 0.05% to 0.45%, and expire at various dates through 2034. At March 31, 2018 the aggregate amount outstanding was $5.8 million and $1.3 million of the term loans have been included in current installments of long-term debt in our condensed consolidated balance sheet. The fair value of our debt approximates the carrying value at March 31, 2018. The term loans are denominated in Japanese Yen and, as a result, amounts disclosed herein will fluctuate because of changes in currency exchange rates.Lines of Credit We have one available line of credit, which provides one of our wholly owned subsidiaries with borrowings up to 2.0 million Swiss Francs. At March 31, 2018 and December 30, 2017, no |
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- Definition The entire disclosure for commitments, contingencies, and guarantees. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Note 8 - Subsequent Event |
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| Subsequent Events [Text Block] | 8. Subsequent EventOn May 8, 2018, we announced that we entered into an Agreement and Plan of Merger (the “Merger Agreement”), dated as of May 7, 2018, by and among Cohu, Inc., a Delaware corporation (“Cohu”), Xavier Acquisition Corporation, a Delaware corporation and a wholly-owned subsidiary of Cohu (the “Merger Sub”) and Xcerra Corporation, a Massachusetts corporation (“Xcerra”). Under the terms of the Merger Agreement, the acquisition of Xcerra will be accomplished through a merger of Merger Sub with and into Xcerra (the “Merger”), with Xcerra surviving the Merger as a wholly-owned subsidiary of Cohu.At the effective time of the Merger, each share of Xcerra’s common stock (“Xcerra Common Stock”) issued and outstanding immediately prior to the Merger (other than dissenting shares and shares held by Cohu, Merger Sub, Xcerra or any of their respective subsidiaries) will be converted into the right to receive (i) $9.00 in cash, without interest, (the “Cash Consideration”) and (ii) 0.2109 of a validly issued, fully paid and nonassessable share of common stock of Cohu (“Cohu Common Stock”) (the “Stock Consideration” and, together with the Cash Consideration, the “Merger Consideration”).Pursuant to the Merger Agreement, each outstanding Xcerra restricted stock unit (a “Xcerra Restricted Stock Unit”) that will either (i) vest automatically according to its terms at the effective time of the Merger, or (ii) is held by members of Xcerra’s board of directors, will be cancelled and converted into the right to receive the Merger Consideration. All Xcerra Restricted Stock Units not described in the preceding sentence that are outstanding and unvested at the effective time of the Merger will be converted into equivalent restricted stock unit awards in respect of Cohu Common Stock using a customary exchange ratio equivalent to the Merger Consideration. Our Board of Directors has unanimously approved the Merger Agreement. Our stockholders will be asked to vote on the issuance of Cohu Common Stock in the Merger at a special stockholders meeting that will be held on a date to be announced. The closing of the Merger is subject to the adoption of the Merger Agreement by the affirmative vote of two -thirds of the outstanding shares of common stock of Xcerra entitled to vote at the special stockholders meeting. We currently expect the Merger, which is subject to stockholder and regulatory approvals, and other customary closing conditions, to close by the end of 2018. The Merger Agreement contains certain customary termination rights, including, among others, (i) the right of either Cohu or Xcerra to terminate the Merger Agreement if Xcerra’s stockholders fail to adopt the Merger Agreement, or if Cohu’s shareholders fail to approve the issuance of Cohu Common Stock, (ii) the right of either party to terminate the Merger Agreement if the board of directors of the other party changes its recommendation, (iii) the right of Xcerra to terminate the Merger Agreement to accept a superior proposal (subject to the payment of a termination fee as described further below) (iv) the right of either Cohu or Xcerra to terminate the Merger Agreement if the Merger has not occurred by November 7, 2018 ( the “Termination Date”, which date the Merger Agreement provides to be extended by either party to May 7, 2019 under certain circumstances) and (v) the right of either party to terminate the Merger Agreement due to a material breach by the other party of any of its representations, warranties or covenants, subject to certain conditions.The Merger Agreement provides for Xcerra to pay to Cohu a termination fee of $22.8 million if the Merger Agreement is terminated (i) by Cohu as a result of the Xcerra board of directors changing its recommendation that Xcerra stockholders adopt the Merger Agreement or if the Merger Agreement is terminated by Xcerra to accept a superior proposal; (ii) as a result of Xcerra stockholder approval not being obtained or the Merger not being consummated by the Termination Date, where a competing proposal was publicly disclosed and not publicly, irrevocably withdrawn prior to Xcerra stockholder meeting or the termination of the Merger Agreement as a result of the Merger not being consummated by the Termination Date, as applicable, and Xcerra subsequently consummates a competing proposal within twelve months of such termination or Xcerra enters into a definitive agreement for a competing proposal within such twelve month period and such competing proposal is subsequently consummated; or (iii) by Cohu if Xcerra is in breach of a representation, warranty or covenant that would cause the closing conditions to fail, and the breach cannot be cured within 20 calendar days, so long as Cohu has not materially breached the Merger Agreement.The Merger Agreement provides for Cohu to pay to Xcerra a termination fee of $22.8 million if the Merger Agreement is terminated by Xcerra (i) if Cohu is in breach of a representation, warranty or covenant that would cause the closing conditions to fail, and the breach cannot be cured within 20 calendar days, so long as Xcerra has not materially breached the Merger Agreement or (ii) if the Cohu board of directors changes its recommendation that the Cohu shareholders approve the issuance of Cohu Common Stock. The Merger Agreement further provides for Cohu to pay to Xcerra a termination fee of $45 million if the Merger Agreement is terminated by Xcerra if, upon the satisfaction of closing conditions and the expiration of a marketing period in connection with Cohu’s debt financing, Cohu fails to consummate the Merger within five business days following written notice from Xcerra to Cohu in the form described in the Merger Agreement.Cohu has obtained debt financing commitments for the transactions contemplated by the Merger Agreement. Deutsche Bank Securities Inc., a subsidiary of Deutsche Bank AG, has committed to capitalize Cohu to fund the transaction. The foregoing description of the Merger and the Merger Agreement does not purport to be complete and is qualified in its entirety by reference to the Merger Agreement, which is filed as Exhibit 2.1 to Cohu’s Current Report on Form 8 K filed with the SEC on May 8, 2018. |
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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Significant Accounting Policies (Policies) |
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| Accounting Policies [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Basis of Accounting, Policy [Policy Text Block] | Basis of Presentation Our fiscal years are based on a 52 - or 53 -week period ending on the last Saturday in December. The condensed consolidated balance sheet at December 30, 2017, has been derived from our audited financial statements at that date. The interim condensed consolidated financial statements as of March 31, 2018, ( also referred to as “the first quarter of fiscal 2018” and “the first three months of fiscal 2018” ) and March 25, 2017, ( also referred to as “the first quarter of fiscal 2017” and “the first three months of fiscal 2017” ) are unaudited. However, in management’s opinion, these financial statements reflect all adjustments (consisting only of normal, recurring items) necessary to provide a fair presentation of our financial position, results of operations and cash flows for the periods presented. The first quarter of fiscal 2018 was comprised of 13 weeks and 2017 was comprised of 12 weeks.Our interim results are not necessarily indicative of the results that should be expected for the full year. For a better understanding of Cohu, Inc. and our financial statements, we recommend reading these interim condensed consolidated financial statements in conjunction with our audited financial statements for the year ended December 30, 2017, which are included in our 2017 Annual Report on Form 10 -K, filed with the U. S. Securities and Exchange Commission (“SEC”). In the following notes to our interim condensed consolidated financial statements, Cohu, Inc. is referred to as “Cohu”, “we”, “our” and “us”. |
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| Concentration Risk, Credit Risk, Policy [Policy Text Block] | Concentration of Credit Risk Financial instruments that potentially subject us to significant credit risk consist principally of cash equivalents, short-term investments and trade accounts receivable. We invest in a variety of financial instruments and, by policy, limit the amount of credit exposure with any one issuer.Trade accounts receivable are presented net of allowance for doubtful accounts of $0.2 March 31, 2018 and December 30, 2017. Our customers include semiconductor manufacturers and semiconductor test subcontractors and other customers located throughout many areas of the world. While we believe that our allowance for doubtful accounts is adequate and represents our best estimate at March 31, 2018, we will continue to monitor customer liquidity and other economic conditions, which may result in changes to our estimates regarding collectability. |
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| Inventory, Policy [Policy Text Block] | Inventories Inventories are stated at the lower of cost, determined on a first -in, first -out basis, or net realizable value. Cost includes labor, material and overhead costs. Determining net realizable value of inventories involves numerous estimates and judgments including projecting average selling prices and sales volumes for future periods and costs to complete and dispose of inventory. As a result of these analyses, we record a charge to cost of sales in advance of the period when the inventory is sold when estimated net realizable values are below our costs.Inventories by category were as follows ( in thousands ):
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| Property, Plant and Equipment, Policy [Policy Text Block] | Property, Plant and Equipment Depreciation and amortization of property, plant and equipment is calculated principally on the straight-line method based on estimated useful lives of thirty to forty years for buildings, five to fifteen years for building improvements and three to ten years for machinery, equipment and software. Land is not depreciated.Property, plant and equipment, at cost, consisted of the following (in thousands) :
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| Segment Reporting, Policy [Policy Text Block] | Segment Information We applied the provisions of ASC Topic 280, Segment Reporting , (“ASC 280” ), which sets forth a management approach to segment reporting and establishes requirements to report selected segment information quarterly and to report annually entity-wide disclosures about products, major customers and the geographies in which the entity holds material assets and reports revenue. An operating segment is defined as a component that engages in business activities whose operating results are reviewed by the chief operating decision maker and for which discrete financial information is available. Based on the provisions of ASC 280, we have determined that our identified operating segments, which are Digital Test Handlers (DTH), Analog Test Handlers (ATH) and Integrated Test Solutions (ITS), qualify for aggregation under ASC 280 due to similarities in their customers, their economic characteristics, and the nature of products and services provided. As a result, we report in one segment, semiconductor equipment. |
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| Goodwill and Intangible Assets, Policy [Policy Text Block] | Goodwill, Other Intangible Assets and Long-lived Assets We evaluate goodwill for impairment annually and when an event occurs or circumstances change that indicate that the carrying value may not be recoverable. We test goodwill for impairment by first comparing the book value of net assets to the fair value of the reporting units. If the fair value is determined to be less than the book value, a second step is performed to compute the amount of impairment as the difference between the estimated fair value of goodwill and the carrying value. We estimated the fair values of our reporting units primarily using the income approach valuation methodology that includes the discounted cash flow method, taking into consideration the market approach and certain market multiples as a validation of the values derived using the discounted cash flow methodology. Forecasts of future cash flows are based on our best estimate of future net sales and operating expenses, based primarily on customer forecasts, industry trade organization data and general economic conditions.We conduct our annual impairment test as of October 1st of each year, and have determined there was no impairment as of October 1, 2017, as we determined that the estimated fair values of our reporting units exceeded their carrying values on that date. Other events and changes in circumstances may also require goodwill to be tested for impairment between annual measurement dates. As of March 31, 2018, we do not believe there have been any events or circumstances that would require us to perform an interim goodwill impairment review. In the event we determine that an interim goodwill impairment review is required, in a future period, the review may result in an impairment charge, which would have a negative impact on our results of operations.Long-lived assets, other than goodwill, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets might not be recoverable. Conditions that would necessitate an impairment assessment include a significant decline in the observable market value of an asset, a significant change in the extent or manner in which an asset is used, or any other significant adverse change that would indicate that the carrying amount of an asset or group of assets may not be recoverable. For long-lived assets, impairment losses are only recorded if the asset’s carrying amount is not recoverable through its undiscounted, probability-weighted future cash flows. We measure the impairment loss based on the difference between the carrying amount and estimated fair value. |
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| Foreign Currency Transactions and Translations Policy [Policy Text Block] | Foreign Remeasurement and Currency Translation Assets and liabilities of our wholly owned foreign subsidiaries that use the U.S. Dollar as their functional currency are re-measured using exchange rates in effect at the end of the period, except for nonmonetary assets, such as inventories and property, plant and equipment, which are re-measured using historical exchange rates. Revenues and costs are re-measured using average exchange rates for the period, except for costs related to those balance sheet items that are re-measured using historical exchange rates. Gains and losses on foreign currency transactions are recognized as incurred. Certain of our foreign subsidiaries have designated the local currency as their functional currency and, as a result, their assets and liabilities are translated at the rate of exchange at the balance sheet date, while revenue and expenses are translated using the average exchange rate for the period. During the three months ended March 31, 2018, and March 25, 2017, we recognized foreign exchange losses of $1.6 million and $1.3 million, respectively, in our consolidated income statements. Cumulative translation adjustments resulting from the translation of the financial statements are included as a separate component of stockholders’ equity. |
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| Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] | Share-Based Compensation We measure and recognize all share-based compensation under the fair value method. Our estimate of share-based compensation expense requires a number of complex and subjective assumptions including our stock price volatility, employee exercise patterns (expected life of the options) and related tax effects. The assumptions used in calculating the fair value of share-based awards represent our best estimates, but these estimates involve inherent uncertainties and the application of management judgment. Although we believe the assumptions and estimates we have made are reasonable and appropriate, changes in assumptions could materially impact our reported financial results. Reported share-based compensation is classified, in the condensed consolidated interim financial statements, as follows (in thousands) :
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| Income Tax, Policy [Policy Text Block] | Income Per Share Basic income per common share is computed by dividing net income by the weighted-average number of common shares outstanding during the reporting period. Diluted income per share includes the dilutive effect of common shares potentially issuable upon the exercise of stock options, vesting of outstanding restricted stock and performance stock units and issuance of stock under our employee stock purchase plan using the treasury stock method. In loss periods, potentially dilutive securities are excluded from the per share computations due to their anti-dilutive effect. For purposes of computing diluted income per share, stock options with exercise prices that exceed the average fair market value of our common stock for the period are excluded. For the three months ended March 31, 2018, approximately 34,000 shares of common stock were excluded from the computation. For the three months ended March 25, 2017, approximately 258,000 shares of common stock were excluded from the computation.The following table reconciles the denominators used in computing basic and diluted income per share (in thousands) :
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| Adoption of New Accounting Standard [Policy Text Block] | Adoption of New Revenue Accounting Standard We adopted Accounting Standards Codification (ASC) Topic 606, Revenue from Contracts with Customers (“ASC 606” ), on December 31, 2017, the first day of our 2018 fiscal year. We elected to implement the new standard using the modified retrospective method of adoption which only applies to those contracts which were not completed as of December 31, 2017. Revenues for the quarter ended March 31, 2018, have been accounted for using ASC 606 and the prior year period ended March 25, 2017, has not been adjusted. Upon adoption of ASC 606, we recorded a cumulative-effect adjustment to retained earnings of $1.1 million on December 31, 2017, which represents the impact of ASC 606 on our deferred revenue.Material changes recorded in connection with the cumulative-effect adjustment were as follows ( in thousands ):
The adoption of ASC 606 had no impact to cash used in net operating, investing or financing activities in our condensed consolidated statements of cash flows. The following table presents the amounts by which financial statement line items included in our condensed consolidated statements of income for the three months ended March 31, 2018 and our condensed consolidated balance sheet at March 31, 2018 were materially affected due to the adoption of ASC 606 (in thousands):
* Balance sheet line items include the cumulative-effect adjustment recorded on December 31, 2017. Under ASC 606 our revenue will continue to be recognized at a point in time when all revenue criteria have been met and transfer of control has occurred, typically, this occurs upon shipment of products to our customers. In certain instances, when customer payment terms provide that a minority portion of the equipment purchase price be paid only upon customer acceptance, recognition of revenue may occur sooner under ASC 606. |
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| Revenue Recognition, Policy [Policy Text Block] | Revenue Recognition Our net sales are derived from the sale of products and services and are adjusted for estimated returns and allowances, which historically have been insignificant. We recognize revenue when the obligations under the terms of a contract with our customers are satisfied; generally, this occurs with the transfer of control of our systems, non-system products or services. In circumstances where control is not transferred until destination or acceptance, we defer revenue recognition until such events occur. Revenue for established products that have previously satisfied a customer’s acceptance requirements is generally recognized upon shipment. In cases where a prior history of customer acceptance cannot be demonstrated or from sales where customer payment dates are not determinable and in the case of new products, revenue and cost of sales are deferred until customer acceptance has been received. Our post-shipment obligations typically include installation and standard warranties. The estimated fair value of installation related revenue is recognized in the period the installation is performed. Service revenue is recognized over time as the transfer of control is completed for the related contract or upon completion of the services if they are short-term in nature. Spares, contactor and kit revenue is generally recognized upon shipment.Certain of our equipment sales have multiple performance obligations. These arrangements involve the delivery or performance of multiple performance obligations, and transfer of control of performance obligations may occur at different points in time or over different periods of time. For arrangements containing multiple performance obligations, the revenue relating to the undelivered performance obligation is deferred using the relative standalone selling price method utilizing estimated sales prices until satisfaction of the deferred performance obligation.Unsatisfied performance obligations primarily represent contracts for products with future delivery dates and with an original expected duration of one year or less. As allowed under ASC 606, we have opted to not disclose unsatisfied performance obligations as these contracts have original expected durations of less than one year.We generally sell our equipment with a product warranty. The product warranty provides assurance to customers that delivered products are as specified in the contract (an “assurance-type warranty”). Therefore, we account for such product warranties under ASC 460, Guarantees (ASC 460 ), and not as a separate performance obligation.The transaction price reflects our expectations about the consideration we will be entitled to receive from the customer and may include fixed or variable amounts. Fixed consideration primarily includes sales to customers that are known as of the end of the reporting period. Variable consideration includes sales in which the amount of consideration that we will receive is unknown as of the end of a reporting period. Such consideration primarily includes sales made to certain customers with cumulative tier volume discounts offered. Variable consideration arrangements are rare; however, when they occur, we estimate variable consideration as the expected value to which we expect to be entitled. Included in the transaction price estimate are amounts in which it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. The estimate is based on information available for projected future sales. Variable consideration that does not meet revenue recognition criteria is deferred. Our contracts are typically less than one year in duration and we have elected to use the practical expedient available in ASC 606 to expense cost to obtain contracts as they are incurred because they would be amortized over less than one year. Accounts receivable represents our unconditional right to receive consideration from our customer. Payments terms do not exceed one year from the invoice date and therefore do not include a significant financing component. To date, there have been no material impairment losses on accounts receivable. There were no material contract assets or contract liabilities recorded on the condensed consolidated balance sheet in any of the periods presented.On shipments where sales are not recognized, gross profit is generally recorded as deferred profit in our consolidated balance sheet representing the difference between the receivable recorded and the inventory shipped. At March 31, 2018, we had deferred revenue totaling approximately $5.9 million, current deferred profit of $2.9 million and deferred profit expected to be recognized after one year included in noncurrent other accrued liabilities of $0.8 million. At December 30, 2017, we had deferred revenue totaling approximately $10.4 million, current deferred profit of $6.6 million and deferred profit expected to be recognized after one year included in noncurrent other accrued liabilities of $0.8 million. Our balances at March 31, 2018, include a $1.1 million beginning retained earnings adjustment as result of our adoption of ASC 606 on the first day of fiscal 2018.The periodic change is primarily a result of increases and decreases in deferrals of revenue associated with product shipments made to our customers in accordance with our revenue recognition policy.Net sales by type are as follows (in thousands):
Revenue by geographic area based upon product shipment destination (in thousands ):
A small number of customers historically have been responsible for a significant portion of our net sales. Significant customer concentration information is as follows:
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| Comprehensive Income, Policy [Policy Text Block] | Accumulated Other Comprehensive Loss Our accumulated other comprehensive loss balance totaled approximately $14.0 million and $17.8 million at March 31, 2018 and December 30, 2017, respectively, and was attributed to all non-owner changes in stockholders’ equity and consists of, on an after-tax basis where applicable, foreign currency adjustments resulting from the translation of certain of our subsidiary accounts where the functional currency is not the U.S. Dollar and adjustments related to postretirement benefits. Reclassification adjustments from accumulated other comprehensive loss during the first three months of fiscal 2018 and 2017 were not significant. |
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| Pension and Other Postretirement Plans, Policy [Policy Text Block] | Retiree Medical Benefits We provide post-retirement health benefits to certain executives and directors under a noncontributory plan. The net periodic benefit cost incurred during the first three months of fiscal 2018 and 2017 was not significant. |
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| Discontinued Operations, Policy [Policy Text Block] | Discontinued Operations In 2015, we sold all of the outstanding stock of our mobile microwave communication equipment segment, Broadcast Microwave Services (BMS), for $4.9 million in cash and up to $2.5 million of contingent cash consideration. Our decision to sell this non-core business resulted from management’s determination that they were no longer a strategic fit within our organization.As part of the divestiture of BMS we recorded a contingent consideration receivable that was classified as Level 3 in the fair value hierarchy. See Note 3, “Financial Instruments Measured at Fair Value” for additional information on the three -tier fair value hierarchy. The contingent consideration represented the estimated fair value of future payments we are due based on BMS achieving annual revenue targets in 2016 and 2017 as specified in the sale agreement. We determined the value of the contingent consideration using a Monte Carlo simulation model with changes to the fair value of the contingent consideration being recognized in discontinued operations. During 2017, BMS failed to meet the necessary revenue targets and the contingent consideration receivable was written-off. Unless otherwise indicated, all amounts herein relate to continuing operations. |
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| New Accounting Pronouncements, Policy [Policy Text Block] | Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements In March 2017, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2017 -07 , Compensation – Retirement Benefits (Topic which provides additional guidance on the presentation of net periodic pension and postretirement benefit costs in the income statement and on the components eligible for capitalization. The amendments in this guidance require that an employer report the service cost component of the net periodic benefit costs in the same income statement line item as other compensation costs arising from services rendered by employees during the period. The non-service-cost components of net periodic benefit costs are to be presented in the income statement separately from the service cost components and outside a subtotal of income from operations. The guidance also allows for the capitalization of the service cost components, when applicable (i.e., as a cost of internally manufactured inventory or a self-constructed asset). The guidance is effective for annual periods beginning after 715 ) – Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, December 15, 2017, including interim periods within those annual periods; early adoption is permitted as of the beginning of an annual period for which financial statements (interim or annual) have not been issued or made available for issuance. The amendments in this guidance are to be applied retrospectively. The adoption of ASU 2017 -07 did not have a material impact on our condensed consolidated financial statements.In January 2017, the FASB issued ASU No. 2017 -01, Clarifying the Definition of a Business . It revises the definition of a business and provides a framework to evaluate when an input and a substantive process are present in an acquisition to be considered a business. This guidance is effective for annual periods beginning after December 15, 2017. The adoption of ASU 2017 -01 did not have a material impact on our condensed consolidated financial statements.In November 2016, the FASB issued ASU No. 2016 -18, Restricted Cash . It requires that amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017. The adoption of ASU 2016 -18 did not have a material impact on our condensed consolidated financial statements.In October 2016, the FASB issued ASU 2016 -16, Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory. ASU 2016 -16 changes the timing of income tax recognition for an intercompany sale of assets excluding inventory. ASU 2016 -16 requires the seller’s tax effects and the buyer’s deferred taxes to be recognized immediately upon the sale instead of deferring accounting for the income tax implications until the assets are sold to a third party or recovered through use. ASU 2016 -16 is effective for fiscal years beginning after December 15, 2017 including interim periods within the year of adoption. The adoption of ASU 2016 -16 did not have a material impact on our condensed consolidated financial statements.In August 2016, the FASB issued ASU No. 2016 -15 , Classification of Certain Cash Receipts and Cash Payments. It provides guidance on eight specific cash flow issues with the objective of reducing the existing diversity in practice in how they are classified in the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted, provided that all of the amendments are adopted in the same period. The adoption of ASU 2016 -15 did not have a material impact on our condensed consolidated financial statements.Recently Issued Accounting Pronouncements In February 2018, the FASB issued ASU 2018 -02, Income Statement-Reporting Comprehensive Income to give companies the option to reclassify the income tax effects on items within accumulated other comprehensive income resulting from U.S. tax reform to retained earnings. ASU 2018 -02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted. We are currently assessing and have not yet determined the impact ASU 2018 -02 may have on our consolidated financial statements.In January 2017, the FASB issued ASU No. 2017 -04, Simplifying the Test for Goodwill Impairment . It eliminates Step 2 from the goodwill impairment test and requires an entity to recognize an impairment charge for the amount by which the carrying amount of goodwill exceeds the reporting unit's fair value, not to exceed the carrying amount of goodwill. This guidance is effective for annual and any interim impairment tests in fiscal years beginning after December 15, 2019. We do not expect this guidance to have any impact on our consolidated financial statements.In February 2016, the FASB issued ASU No. 2016 -02, Leases (Topic Under this guidance, lessees will be required to recognize a right-of-use asset and a lease liability for all operating leases defined under previous GAAP. This guidance is effective for interim and annual reporting periods beginning after 842 ). December 15, 2018. The new guidance must be adopted using a modified retrospective transition, and provides for certain practical expedients. We are still completing our analysis on the impact this guidance will have on our consolidated financial statements and related disclosures, but recognizing the lease liabilities and related right-of-use assets will have a material impact on our balance sheet. |
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- Definition Disclosure of accounting policy for (1) transactions denominated in a currency other than the reporting enterprise's functional currency, (2) translating foreign currency financial statements that are incorporated into the financial statements of the reporting enterprise by consolidation, combination, or the equity method of accounting, and (3) remeasurement of the financial statements of a foreign reporting enterprise in a hyperinflationary economy. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Disclosure of accounting policy for goodwill and intangible assets. This accounting policy also may address how an entity assesses and measures impairment of goodwill and intangible assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Disclosure of accounting policy for pension and other postretirement benefit plans. This accounting policy may address (1) the types of plans sponsored by the entity, and the benefits provided by each plan (2) groups that participate in (or are covered by) each plan (3) how plan assets, liabilities and expenses are measured, including the use of any actuaries and (4) significant assumptions used by the entity to value plan assets and liabilities and how such assumptions are derived. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Disclosure of accounting policy for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, basis of assets, depreciation and depletion methods used, including composite deprecation, estimated useful lives, capitalization policy, accounting treatment for costs incurred for repairs and maintenance, capitalized interest and the method it is calculated, disposals and impairments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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- Definition Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
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| Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] |
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| Disaggregation of Revenue [Table Text Block] |
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| Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
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| X | ||||||||||
- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
Note 2 - Business Acquisitions, Goodwill and Purchased Intangible Assets (Tables) |
3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2018 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Business Acquisitions, by Acquisition [Table Text Block] |
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| Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block] |
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| Schedule of Goodwill [Table Text Block] |
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| Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] |
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| X | ||||||||||
- Definition Tabular disclosure of contingent payment arrangements including the terms that will result in payment and the accounting treatment that will be followed if such contingencies occur, including the potential impact on earnings per share if contingencies are to be settled in common stock of the entity. The description also may include the period over which amounts are expected to be paid, and changes in the amount since the previous reporting period. This also includes contingent options and commitments. No definition available.
|
| X | ||||||||||
- Definition Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Tabular disclosure of finite-lived intangible assets acquired as part of a business combination or through an asset purchase, by major class and in total, including the value of the asset acquired, any significant residual value (the expected value of the asset at the end of its useful life) and the weighted-average amortization period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
Note 3 - Financial Instruments Measured at Fair Value (Tables) |
3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2018 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Available-for-sale Securities [Table Text Block] |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
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| Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
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| X | ||||||||||
- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. No definition available.
|
| X | ||||||||||
- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. No definition available.
|
| X | ||||||||||
- References No definition available.
|
Note 7 - Guarantees and Other Obligations (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Product Warranty Liability [Table Text Block] |
|
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| X | ||||||||||
- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Oct. 01, 2017
USD ($)
|
Mar. 31, 2018
USD ($)
shares
|
Mar. 25, 2017
USD ($)
shares
|
Dec. 26, 2015
USD ($)
|
Dec. 31, 2017
USD ($)
|
Dec. 30, 2017
USD ($)
|
|
| Allowance for Doubtful Accounts Receivable, Current, Ending Balance | $ 200 | $ 200 | ||||
| Number of Operating Segments | 1 | |||||
| Goodwill and Intangible Asset Impairment, Total | $ 0 | |||||
| Foreign Currency Transaction Gain (Loss), Realized | $ (1,600) | $ (1,300) | ||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 34,000 | 258,000 | ||||
| Deferred Revenue | $ 5,900 | 10,400 | ||||
| Deferred Profit | 2,914 | $ 5,350 | 6,608 | |||
| Accumulated Other Comprehensive Income (Loss), Net of Tax, Total | (14,016) | (17,787) | ||||
| Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | 0 | $ 0 | ||||
| Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 0 | $ 0 | ||||
| Broadcast Microwave Services, Inc. (“BMS”) [Member] | ||||||
| Proceeds from Divestiture of Businesses | $ 4,900 | |||||
| Disposal Group, Including Discontinued Operation, Contingent Consideration | $ 2,500 | |||||
| Non-current Other Accrued Liabilities [Member] | ||||||
| Deferred Profit Recognized After Year One | $ 800 | $ 800 | ||||
| Accounting Standards Update 2014-09 [Member] | ||||||
| Deferred Profit | (1,258) | |||||
| Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] | ||||||
| Cumulative Effect of New Accounting Principle in Period of Adoption | $ 1,100 | |||||
| Building [Member] | Minimum [Member] | ||||||
| Property, Plant and Equipment, Useful Life | 30 years | |||||
| Building [Member] | Maximum [Member] | ||||||
| Property, Plant and Equipment, Useful Life | 40 years | |||||
| Building Improvements [Member] | Minimum [Member] | ||||||
| Property, Plant and Equipment, Useful Life | 5 years | |||||
| Building Improvements [Member] | Maximum [Member] | ||||||
| Property, Plant and Equipment, Useful Life | 15 years | |||||
| Machinery, Equipment and Software [Member] | Minimum [Member] | ||||||
| Property, Plant and Equipment, Useful Life | 3 years | |||||
| Machinery, Equipment and Software [Member] | Maximum [Member] | ||||||
| Property, Plant and Equipment, Useful Life | 10 years | |||||
| X | ||||||||||
- Definition The carrying value of deferred revenue, net of expenses, as of the balance sheet date that is expected to be recognized as such within one year or the normal operating cycle, if longer. No definition available.
|
| X | ||||||||||
- Definition The carrying value of deferred revenue, net of expenses, as of the balance sheet date which is expected to be taken into income after one year or beyond the normal operating cycle, if longer. No definition available.
|
| X | ||||||||||
- Definition Maximum amount of contingent consideration receivable for the disposal of assets and liabilities, including discontinued operation. No definition available.
|
| X | ||||||||||
- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. No definition available.
|
| X | ||||||||||
- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. No definition available.
|
| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. No definition available.
|
| X | ||||||||||
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. No definition available.
|
| X | ||||||||||
- Definition Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Note 1 - Summary of Significant Accounting Policies - Inventories (Details) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 30, 2017 |
|||
|---|---|---|---|---|---|
| Raw materials and purchased parts | $ 27,277 | $ 27,918 | |||
| Work in process | 25,267 | 25,130 | |||
| Finished goods | 10,132 | 9,037 | |||
| Total inventories | $ 62,676 | $ 62,085 | [1] | ||
| |||||
| X | ||||||||||
- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. This amount is net of valuation reserves and adjustments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 30, 2017 |
|||
|---|---|---|---|---|---|
| Property, plant and equipment | $ 68,614 | $ 67,129 | |||
| Less accumulated depreciation and amortization | (33,492) | (32,957) | |||
| Property, plant and equipment, net | 35,122 | 34,172 | [1] | ||
| Land and Land Improvements [Member] | |||||
| Property, plant and equipment | 8,331 | 8,017 | |||
| Building and Building Improvements [Member] | |||||
| Property, plant and equipment | 14,265 | 13,779 | |||
| Machinery and Equipment [Member] | |||||
| Property, plant and equipment | $ 46,018 | $ 45,333 | |||
| |||||
| X | ||||||||||
- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Note 1 - Summary of Significant Accounting Policies - Reported Share-based Compensation (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 25, 2017 |
|
| Allocated share-based compensation | $ 1,669 | $ 1,717 |
| Income tax benefit | (314) | (75) |
| Total share-based compensation, net | 1,355 | 1,642 |
| Cost of Sales [Member] | ||
| Allocated share-based compensation | 121 | 83 |
| Research and Development Expense [Member] | ||
| Allocated share-based compensation | 349 | 316 |
| Selling, General and Administrative Expenses [Member] | ||
| Allocated share-based compensation | $ 1,199 | $ 1,318 |
| X | ||||||||||
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. No definition available.
|
| X | ||||||||||
- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Note 1 - Summary of Significant Accounting Policies - Computation of Basic and Diluted Income (Loss) Per Share (Details) - shares shares in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 25, 2017 |
|
| Weighted average common shares (in shares) | 28,602 | 26,978 |
| Effect of dilutive securities (in shares) | 929 | 1,274 |
| (in shares) | 29,531 | 28,252 |
| X | ||||||||||
- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
Note 1 - Summary of Significant Accounting Policies - Cumulative-effect Adjustments (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2018 |
Mar. 25, 2017 |
Dec. 31, 2017 |
Dec. 30, 2017 |
||||
| Deferred profit | $ 2,914 | $ 2,914 | $ 5,350 | $ 6,608 | ||||
| Income taxes payable | 1,546 | 1,546 | 2,360 | 2,159 | [1] | |||
| Retained earnings | 158,124 | 158,124 | 151,783 | 150,726 | [1] | |||
| Net sales | 95,150 | 95,150 | $ 81,097 | |||||
| Income tax provision | 2,127 | 2,127 | 1,358 | |||||
| Net income | $ 8,122 | $ 8,122 | $ 6,763 | |||||
| Basic: (in dollars per share) | $ 0.28 | $ 0.28 | $ 0.25 | |||||
| Diluted: (in dollars per share) | $ 0.28 | $ 0.28 | $ 0.24 | |||||
| Deferred income taxes | $ 3,812 | $ 3,812 | $ 2,921 | [1] | ||||
| Calculated under Revenue Guidance in Effect before Topic 606 [Member] | ||||||||
| Deferred profit | 6,664 | 6,664 | ||||||
| Income taxes payable | 984 | 984 | ||||||
| Retained earnings | 154,819 | 154,819 | ||||||
| Net sales | 92,662 | |||||||
| Income tax provision | 1,883 | |||||||
| Net income | $ 5,878 | |||||||
| Basic: (in dollars per share) | $ 0.21 | |||||||
| Diluted: (in dollars per share) | $ 0.20 | |||||||
| Deferred income taxes | $ 3,929 | 3,929 | ||||||
| Accounting Standards Update 2014-09 [Member] | ||||||||
| Deferred profit | (1,258) | |||||||
| Income taxes payable | 201 | |||||||
| Retained earnings | $ 1,057 | |||||||
| Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | ||||||||
| Deferred profit | (3,750) | (3,750) | ||||||
| Income taxes payable | 562 | 562 | ||||||
| Retained earnings | 3,305 | 3,305 | ||||||
| Net sales | 2,488 | |||||||
| Income tax provision | 244 | |||||||
| Net income | $ 2,244 | |||||||
| Basic: (in dollars per share) | $ 0.07 | |||||||
| Diluted: (in dollars per share) | $ 0.08 | |||||||
| Deferred income taxes | $ (117) | $ (117) | ||||||
| ||||||||
| X | ||||||||||
- Definition The carrying value of deferred revenue, net of expenses, as of the balance sheet date that is expected to be recognized as such within one year or the normal operating cycle, if longer. No definition available.
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2018 |
Mar. 25, 2017 |
|
| Net sales | $ 95,150 | $ 95,150 | $ 81,097 |
| CHINA | |||
| Net sales | 20,243 | ||
| UNITED STATES | |||
| Net sales | 14,478 | ||
| Malaysia [Member] | |||
| Net sales | 11,809 | ||
| PHILIPPINES | |||
| Net sales | 10,546 | ||
| Rest of the World [Member] | |||
| Net sales | 38,074 | ||
| Systems [Member] | |||
| Net sales | 54,905 | ||
| Non-systems [Member] | |||
| Net sales | $ 40,245 | ||
| X | ||||||||||
- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Note 1 - Summary of Significant Accounting Policies - Customer Concentration (Details) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member] |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 25, 2017 |
|
| Customers individually accounting for more than 10% of net sales | 1 | 1 |
| One Customer [Member] | ||
| Percentage of net sales | 12.00% | 20.00% |
| X | ||||||||||
- Definition Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc. No definition available.
|
| X | ||||||||||
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Note 2 - Business Acquisitions, Goodwill and Purchased Intangible Assets (Details Textual) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 25, 2017 |
|
| Amortization of Intangible Assets, Total | $ 1,100 | $ 1,100 |
| Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] | ||
| Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | 3,000 | 3,000 |
| Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] | Selling, General and Administrative Expenses [Member] | ||
| Business Combination, Acquisition Related Costs | $ 0 | $ 200 |
| X | ||||||||||
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Note 2 - Business Acquisitions, Goodwill and Purchased Intangible Assets - Total Purchase Price (Details) - Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] $ in Thousands |
Jan. 04, 2017
USD ($)
|
|---|---|
| Cash paid to Kita shareholders | $ 15,000 |
| Fair value of contingent consideration | 823 |
| Total purchase price | $ 15,823 |
| X | ||||||||||
- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
Note 2 - Business Acquisitions, Goodwill and Purchased Intangible Assets - Fair Value of Contingent Consideration (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 25, 2017 |
|
| Adjustment to contingent consideration liability | $ (147) | |
| Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] | ||
| Balance for contingent consideration | 823 | |
| Settlement of contingent consideration | (1,500) | |
| Adjustment to contingent consideration liability | 1,276 | |
| Impact of currency exchange | 141 | |
| Balance for contingent consideration | $ 740 | |
| X | ||||||||||
- Definition The amount increase (decrease) in the value of foreign currency translation gain (loss) of a contingent consideration. No definition available.
|
| X | ||||||||||
- Definition Amount of increase (decrease) in the settlement value of a contingent consideration. No definition available.
|
| X | ||||||||||
- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of liability recognized arising from contingent consideration in a business combination. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
Note 2 - Business Acquisitions, Goodwill and Other Purchased Intangible Assets - Changes in Carrying Value of Goodwill (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Mar. 31, 2018 |
Dec. 30, 2017 |
|||||
| Beginning balance | $ 65,613 | [1] | $ 58,849 | |||
| Additions, net | 2,654 | |||||
| Impact of currency exchange | 1,171 | 4,110 | ||||
| Ending balance | $ 66,784 | $ 65,613 | [1] | |||
| ||||||
| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
Note 2 - Business Acquisitions - Preliminary Allocation of Intangible Assets (Details) - Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Dec. 30, 2017 |
|
| Gross carrying amount | $ 36,072 | $ 35,212 |
| Accumulated amortization | 19,941 | 18,464 |
| Developed Technology Rights [Member] | ||
| Gross carrying amount | 21,263 | 20,780 |
| Accumulated amortization | $ 13,567 | 12,623 |
| Finite-lived intangible assets, average useful life (Year) | 3 years 36 days | |
| Customer Relationships [Member] | ||
| Gross carrying amount | $ 8,131 | 7,934 |
| Accumulated amortization | $ 5,215 | 4,838 |
| Finite-lived intangible assets, average useful life (Year) | 2 years 292 days | |
| Trade Names [Member] | ||
| Gross carrying amount | $ 6,347 | 6,185 |
| Accumulated amortization | $ 1,118 | 972 |
| Finite-lived intangible assets, average useful life (Year) | 11 years 328 days | |
| Noncompete Agreements [Member] | ||
| Gross carrying amount | $ 331 | 313 |
| Accumulated amortization | $ 41 | $ 31 |
| Finite-lived intangible assets, average useful life (Year) | 8 years 292 days |
| X | ||||||||||
- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Note 3 - Financial Instruments Measured at Fair Value (Details Textual) - USD ($) $ in Millions |
Mar. 31, 2018 |
Dec. 30, 2017 |
|---|---|---|
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 23.5 | $ 13.2 |
| X | ||||||||||
- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. No definition available.
|
Note 3 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 30, 2017 |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Amortized Cost | $ 24,612 | $ 21,338 | ||||||||
| Gross Unrealized Gains | 1 | |||||||||
| Gross Unrealized Losses | [1] | 18 | 10 | |||||||
| Short-term investments | 24,594 | 21,329 | [2] | |||||||
| Corporate Debt Securities [Member] | ||||||||||
| Amortized Cost | [3] | 11,313 | 12,784 | |||||||
| Gross Unrealized Gains | [3] | 1 | ||||||||
| Gross Unrealized Losses | [1],[3] | 9 | 6 | |||||||
| Short-term investments | [3] | 11,304 | 12,779 | |||||||
| US Treasury Securities [Member] | ||||||||||
| Amortized Cost | 8,913 | 7,935 | ||||||||
| Gross Unrealized Gains | ||||||||||
| Gross Unrealized Losses | [1] | 8 | 4 | |||||||
| Short-term investments | 8,905 | 7,931 | ||||||||
| Certificates of Deposit [Member] | ||||||||||
| Amortized Cost | 2,800 | |||||||||
| Gross Unrealized Gains | ||||||||||
| Gross Unrealized Losses | [1] | 1 | ||||||||
| Short-term investments | 2,799 | |||||||||
| Debt Security, Government, Non-US [Member] | ||||||||||
| Amortized Cost | 594 | 619 | ||||||||
| Gross Unrealized Gains | ||||||||||
| Gross Unrealized Losses | [1] | |||||||||
| Short-term investments | 594 | $ 619 | ||||||||
| US Government-sponsored Enterprises Debt Securities [Member] | ||||||||||
| Amortized Cost | 992 | |||||||||
| Gross Unrealized Gains | ||||||||||
| Gross Unrealized Losses | [1] | |||||||||
| Short-term investments | $ 992 | |||||||||
| ||||||||||
| X | ||||||||||
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. No definition available.
|
| X | ||||||||||
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. No definition available.
|
| X | ||||||||||
- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Note 3 - Financial Instruments Measured at Fair Value - Effective Maturities of Short-term Investments (Details) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 30, 2017 |
|---|---|---|
| Due in one year or less, amortized cost | $ 24,612 | $ 21,338 |
| Due in one year or less, estimated fair value | $ 24,594 | $ 21,329 |
| X | ||||||||||
- Definition Amortized cost of investment in debt security measured at fair value with change recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
Note 3 - Financial Instruments Measured at Fair Value - Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 30, 2017 |
|---|---|---|
| $ 139,730 | $ 155,615 | |
| US Treasury Securities [Member] | ||
| Short-term investments | 9,904 | 8,431 |
| Corporate Debt Securities [Member] | ||
| Short-term investments | 25,330 | 22,014 |
| US Government-sponsored Enterprises Debt Securities [Member] | ||
| Short-term investments | 992 | 1,496 |
| Certificates of Deposit [Member] | ||
| Short-term investments | 2,798 | |
| Debt Security, Government, Non-US [Member] | ||
| Short-term investments | 595 | 619 |
| Cash [Member] | ||
| Cash and cash equivalents | 84,773 | 100,850 |
| Money Market Funds [Member] | ||
| Cash and cash equivalents | 15,338 | 22,205 |
| Fair Value, Inputs, Level 1 [Member] | ||
| 84,773 | 100,850 | |
| Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] | ||
| Short-term investments | ||
| Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] | ||
| Short-term investments | ||
| Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | ||
| Short-term investments | ||
| Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member] | ||
| Short-term investments | ||
| Fair Value, Inputs, Level 1 [Member] | Debt Security, Government, Non-US [Member] | ||
| Short-term investments | ||
| Fair Value, Inputs, Level 1 [Member] | Cash [Member] | ||
| Cash and cash equivalents | 84,773 | 100,850 |
| Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] | ||
| Cash and cash equivalents | ||
| Fair Value, Inputs, Level 2 [Member] | ||
| 54,957 | 54,765 | |
| Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] | ||
| Short-term investments | 9,904 | 8,431 |
| Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | ||
| Short-term investments | 25,330 | 22,014 |
| Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | ||
| Short-term investments | 992 | 1,496 |
| Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] | ||
| Short-term investments | 2,798 | |
| Fair Value, Inputs, Level 2 [Member] | Debt Security, Government, Non-US [Member] | ||
| Short-term investments | 595 | 619 |
| Fair Value, Inputs, Level 2 [Member] | Cash [Member] | ||
| Cash and cash equivalents | ||
| Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] | ||
| Cash and cash equivalents | 15,338 | 22,205 |
| Fair Value, Inputs, Level 3 [Member] | ||
| Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] | ||
| Short-term investments | ||
| Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | ||
| Short-term investments | ||
| Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | ||
| Short-term investments | ||
| Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member] | ||
| Short-term investments | ||
| Fair Value, Inputs, Level 3 [Member] | Debt Security, Government, Non-US [Member] | ||
| Short-term investments | ||
| Fair Value, Inputs, Level 3 [Member] | Cash [Member] | ||
| Cash and cash equivalents | ||
| Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] | ||
| Cash and cash equivalents |
| X | ||||||||||
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. No definition available.
|
| X | ||||||||||
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. No definition available.
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| X | ||||||||||
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| X | ||||||||||
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| X | ||||||||||
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| X | ||||||||||
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| X | ||||||||||
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| X | ||||||||||
- Details
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| X | ||||||||||
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Note 4 - Employee Stock Benefit Plans (Details Textual) $ / shares in Units, $ in Millions |
3 Months Ended |
|---|---|
|
Mar. 31, 2018
USD ($)
$ / shares
shares
| |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 19,000 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 453,226 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares | $ 10.18 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ | $ 5.7 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | 4 years 73 days |
| Employee Stock Option [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |
| Restricted Stock Units (RSUs) [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 250,342 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 409,215 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance | 812,639 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $ | $ 18.5 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms | 1 year 255 days |
| Performance Shares [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 88,418 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 39,174 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance | 343,771 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $ | $ 7.8 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms | 1 year 292 days |
| Equity Based Performance Stock Units Granted in 2018, 2017, and 2016 [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |
| Equity Based Performance Stock Units Granted in 2018, 2017, and 2016 [Member] | Vest on the Third Anniversary of Awards Grant [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 100.00% |
| Equity-based Performance Stock Units Granted in 2015 [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award, Performance Criteria Period | 2 years |
| Equity-based Performance Stock Units Granted in 2015 [Member] | Vest on the Second and Third Anniversary of Awards Grant [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 50.00% |
| Minimum [Member] | Employee Stock Option [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year |
| Minimum [Member] | Performance Shares [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Available for Issue | 25.00% |
| Maximum [Member] | Employee Stock Option [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |
| Maximum [Member] | Performance Shares [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Available for Issue | 200.00% |
| Equity Incentive Plan 2005 [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 1,215,372 |
| Equity Incentive Plan 2005 [Member] | Minimum [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year |
| Equity Incentive Plan 2005 [Member] | Maximum [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |
| Employee Stock Purchase Plan [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 601,340 |
| Percentage of Fair Value to Determine Price of Common Stock | 85.00% |
| Stock Issued During Period, Shares, Employee Stock Purchase Plans | 0 |
| X | ||||||||||
- Definition Percentage of the Fair Value to Determine the price of common stock. No definition available.
|
| X | ||||||||||
- Definition Represents share based compensation arrangement by share based payment award percentage of shares available for issue. No definition available.
|
| X | ||||||||||
- Definition In a performance-based equity compensation plan, the timing in which performance goals are set relative to the grant date. No definition available.
|
| X | ||||||||||
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. No definition available.
|
| X | ||||||||||
- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Percentage of vesting of share-based compensation awards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. No definition available.
|
| X | ||||||||||
- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of shares issued during the period as a result of an employee stock purchase plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 25, 2017 |
|
| Effective Income Tax Rate Reconciliation, Percent, Total | 20.80% | 16.70% |
| Unrecognized Tax Benefits, Period Increase (Decrease), Total | $ 0 | $ 0 |
| X | ||||||||||
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
Note 7 - Guarantees and Other Obligations (Details Textual) SFr in Thousands, $ in Thousands |
3 Months Ended | |||||
|---|---|---|---|---|---|---|
|
Mar. 31, 2018
USD ($)
|
Mar. 31, 2018
CHF (SFr)
|
Dec. 30, 2017
USD ($)
|
||||
| Loans Payable to Bank, Current | $ 1,291 | $ 1,280 | [1] | |||
| Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] | Long-term Borrowings Assumed in Business Acquisition [Member] | ||||||
| Long-term Debt, Total | 5,800 | |||||
| Loans Payable to Bank, Current | 1,300 | |||||
| Revolving Credit Facility [Member] | Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] | ||||||
| Line of Credit Facility, Maximum Borrowing Capacity | 6,600 | |||||
| Long-term Line of Credit, Total | 3,300 | |||||
| Line of Credit Available to Ismeca Subsidiary [Member] | ||||||
| Line of Credit Facility, Maximum Borrowing Capacity | SFr | SFr 2,000 | |||||
| Long-term Line of Credit, Total | SFr 0 | 0 | ||||
| Non-current Other Accrued Liabilities [Member] | ||||||
| Product Warranty Accrual, Noncurrent | $ 300 | $ 600 | ||||
| Minimum [Member] | ||||||
| Standard Product Warranty Term | 1 year | |||||
| Minimum [Member] | Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] | Long-term Borrowings Assumed in Business Acquisition [Member] | ||||||
| Debt Instrument, Interest Rate, Stated Percentage | 0.05% | 0.05% | ||||
| Maximum [Member] | ||||||
| Standard Product Warranty Term | 3 years | |||||
| Maximum [Member] | Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] | Long-term Borrowings Assumed in Business Acquisition [Member] | ||||||
| Debt Instrument, Interest Rate, Stated Percentage | 0.45% | 0.45% | ||||
| ||||||
| X | ||||||||||
- Definition Describes the term of the product warranty. No definition available.
|
| X | ||||||||||
- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of current portion of long-term loans payable to bank due within one year or the operating cycle if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
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Note 7 - Guarantees and Other Obligations - Changes in Accrued Warranty (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Balance at beginning of period | $ 4,849 | $ 4,350 |
| Warranty expense accruals | 1,582 | 1,736 |
| Warranty payments | (1,515) | (1,191) |
| Warranty liability assumed | 50 | |
| Balance at end of period | $ 4,916 | $ 4,945 |
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of increase in the standard and extended product warranty accrual from a business acquisition. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of increase in the standard and extended product warranty accrual from warranties issued. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
Note 8 - Subsequent Event (Details Textual) - Xcerra [Member] - USD ($) $ / shares in Units, $ in Millions |
Nov. 07, 2018 |
May 08, 2018 |
|---|---|---|
| Scenario, Forecast [Member] | ||
| Business Combination, Termination Fee by Acquiree | $ 22.8 | |
| Scenario, Forecast [Member] | Termination Fee If Cohu Fails to Consummate the Merger [Member] | ||
| Business Combination, Termination Fee by Acquiree | $ 45.0 | |
| Subsequent Event [Member] | ||
| Business Acquisition, Share Price | $ 9 | |
| Business Combination, Right to Receive, Per Share, Common Stock | 0.2109 |
| X | ||||||||||
- Definition The amount of shares that holders of the acquired companies stock will receive during a business combination. No definition available.
|
| X | ||||||||||
- Definition The amount that the acquiree may be required to pay if the business combination agreement is terminated. No definition available.
|
| X | ||||||||||
- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. No definition available.
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
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