Cohu (COHU) 10-Q 28 Jul 17 2017 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 24, 2017	Jul. 20, 2017
Document Information [Line Items]
Entity Registrant Name	COHU INC
Entity Central Index Key	21,535
Trading Symbol	cohu
Current Fiscal Year End Date	--12-30
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)		27,959,855
Document Type	10-Q
Document Period End Date	Jun. 24, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 24, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 92,472	$ 96,045	[1]
Short-term investments	21,810	31,990	[1]
Accounts receivable, net	90,478	63,019	[1]
Inventories:
Raw materials and purchased parts	28,120	23,037	[1]
Work in process	25,641	17,599	[1]
Finished goods	6,586	4,866	[1]
	60,347	45,502	[1]
Other current assets	11,344	8,593	[1]
Total current assets	276,451	245,149	[1]
Property, plant and equipment, at cost:
Land and land improvements	7,779	4,079	[1]
Buildings and building improvements	13,381	7,967	[1]
Machinery and equipment	42,996	35,157	[1]
	64,156	47,203	[1]
Less accumulated depreciation and amortization	(31,313)	(28,969)	[1]
Net property, plant and equipment	32,843	18,234	[1]
Goodwill	66,038	58,849	[1]
Intangible assets, net	18,742	17,835	[1]
Other assets	7,270	5,445	[1]
	401,344	345,512	[1]
Current liabilities:
Short-term borrowings	3,172		[1]
Current installments of long-term debt	1,409		[1]
Accounts payable	40,507	31,444	[1]
Accrued compensation and benefits	16,251	14,770	[1]
Accrued warranty	4,393	3,737	[1]
Deferred profit	6,347	6,886	[1]
Income taxes payable	2,220	1,920	[1]
Other accrued liabilities	11,322	9,932	[1]
Total current liabilities	85,621	68,689	[1]
Accrued retirement benefits	16,986	15,673	[1]
Noncurrent deferred gain on sale of facility	10,961	11,689	[1]
Deferred income taxes	7,228	5,852	[1]
Noncurrent income tax liabilities	7,280	6,375	[1]
Long-term debt, excluding current installments	5,265		[1]
Other accrued liabilities	3,455	1,765	[1]
Stockholders' equity:
Preferred stock, $1 par value; 1,000 shares authorized, none issued			[1]
Common stock, $1 par value; 60,000 shares authorized, 27,889 shares issued and outstanding in 2017 and 26,842 shares in 2016	27,889	26,842	[1]
Paid-in capital	118,799	111,950	[1]
Retained earnings	138,464	124,559	[1]
Accumulated other comprehensive loss	(20,604)	(27,882)
Total stockholders' equity	264,548	235,469	[1]
	$ 401,344	$ 345,512	[1]
[1]	Derived from December 31, 2016 audited financial statements

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares shares in Thousands	Jun. 24, 2017	Dec. 31, 2016
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)	27,889	26,842
Common stock, shares outstanding (in shares)	27,889	26,842

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 24, 2017	Jun. 25, 2016	Jun. 24, 2017	Jun. 25, 2016
Net sales	$ 93,866	$ 76,353	$ 174,963	$ 142,131
Cost and expenses:
Cost of sales	56,736	49,614	105,577	96,110
Research and development	9,466	8,345	19,242	16,025
Selling, general and administrative	16,020	15,175	30,480	28,289
	82,222	73,134	155,299	140,424
Income from operations	11,644	3,219	19,664	1,707
Interest and other, net	142	59	243	102
Income from continuing operations before taxes	11,786	3,278	19,907	1,809
Income tax provision	1,078	761	2,436	983
Income from continuing operations	10,708	2,517	17,471	826
Loss from discontinued operations	(278)	(55)	(278)	(55)
Net income	$ 10,430	$ 2,462	$ 17,193	$ 771
Basic:
Income from continuing operations (in dollars per share)	$ 0.39	$ 0.09	$ 0.64	$ 0.03
Loss from discontinued operations (in dollars per share)	(0.01)	0	(0.01)	0
Net income (in dollars per share)	0.38	0.09	0.63	0.03
Diluted:
Income from continuing operations (in dollars per share)	0.37	0.09	0.61	0.03
Loss from discontinued operations (in dollars per share)	(0.01)	0	(0.01)	0
Net income (in dollars per share)	$ 0.36	$ 0.09	$ 0.60	$ 0.03
Weighted average shares used in computing income (loss) per share:
Basic (in shares)	27,708	26,711	27,343	26,514
Diluted (in shares)	28,725	27,385	28,488	27,390
Cash dividends declared per share (in dollars per share)	$ 0.06	$ 0.06	$ 0.12	$ 0.12

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 24, 2017	Jun. 25, 2016	Jun. 24, 2017	Jun. 25, 2016
Net income	$ 10,430	$ 2,462	$ 17,193	$ 771
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	3,359	(342)	7,405	2,163
Adjustments related to postretirement benefits	(59)	(15)	(128)	(33)
Change in unrealized gain/loss on investments		1	1	2
Other comprehensive income (loss), net of tax	3,300	(356)	7,278	2,132
Comprehensive income	$ 13,730	$ 2,106	$ 24,471	$ 2,903

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 24, 2017		Jun. 25, 2016
Cash flows from operating activities:
Net income	$ 17,193		$ 771
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Loss on disposal of microwave communications equipment business	278		55
Depreciation and amortization	4,339		5,365
Share-based compensation expense	3,476		3,533
Deferred income taxes	(986)		(740)
Changes in other accrued liabilities	308		271
Changes in other assets	90		(30)
(Gain) loss on disposal of assets	(21)		38
Changes in current assets and liabilities, excluding effects from acquisitions:
Accounts receivable	(23,106)		(2,811)
Inventories	(9,557)		1,045
Accounts payable	7,034		514
Other current assets	(1,773)		(1,362)
Income taxes payable	822		(2,647)
Deferred profit	(610)		3,130
Accrued compensation, warranty and other liabilities	(279)		(1,170)
Net cash provided by (used in) operating activities	(2,792)		5,962
Cash flows from investing activities, excluding effects from acquisitions:
Sales and maturities of short-term investments	30,657		6,991
Purchases of short-term investments	(20,477)		(14,554)
Cash paid for Kita, net of cash received	(11,716)
Purchases of property, plant and equipment	(2,415)		(1,767)
Cash received from sale of fixed assets	109		813
Net cash used in investing activities	(3,842)		(8,517)
Cash flows from financing activities:
Issuance (repurchases) of common stock, net	4,420		(1,560)
Cash dividends paid	(3,221)		(3,148)
Repayments of long-term debt	(840)
Net cash provided by (used in) financing activities	359		(4,708)
Effect of exchange rate changes on cash and cash equivalents	2,702		606
Net decrease in cash and cash equivalents	(3,573)		(6,657)
Cash and cash equivalents at beginning of period	96,045	[1]	115,370
Cash and cash equivalents at end of period	92,472		108,713
Supplemental disclosure of cash flow information:
Cash paid for income taxes	3,761		5,161
Inventory capitalized as property, plant and equipment	122		142
Property, plant and equipment purchases included in accounts payable	348		131
Dividends declared but not yet paid	$ 1,673		$ 1,601
[1]	Derived from December 31, 2016 audited financial statements

Note 1 - Summary of Significant

Note 1 - Summary of Significant Accounting Policies	6 Months Ended
	Jun. 24, 2017
Notes to Financial Statements
Significant Accounting Policies [Text Block]	1. Summary of Significant Accounting Policies Basis of Presentation Our fiscal years are based on a 52 53 December. December 31, 2016 dated financial statements as of June 24, 2017 ( second 2017” first six 2017” June 25, 2016 ( second 2016” first six 2016” three six June 24, 2017 comprised of 13 25 three six June 25, 2016 comprised of 13 26 Our interim results are not 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 31, 2016, 2016 10 Certain prior year amounts have been restated as a result of our early adoption of Accounting Standards Update (“ASU”) No. 2016 09, 718 Improvements to Employee Share-Based Payment Accounting 2016 09 2016 09 December 15, 2016, 2016 09 fourth 2016. As part of our adoption of ASU 2016 09 three six June 25, 2016 $0.1 $0.1 Discontinued Operations In June 2015, 6, 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 Trade accounts receivable are presented net of allowance for doubtful accounts of $0.1 million at both June 24, 2017 December 31, 2016. June 24, 2017, may Segment Information We applied the provisions of ASC Topic 280, Segment Reporting 280” 280, 280 one 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 first second We conduct our annual impairment test as of October 1st no October 1, 2016 may June 24, 2017, not may 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 may not ’s carrying amount is not Foreign 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. During the three six June 24, 2017, we recognized foreign exchange losses of $1.2 $2.5 three six ended June 25, 2016, $0.3 $0.8 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) : Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Cost of sales $ 121 $ 115 $ 204 $ 208 Research and development 262 334 578 628 Selling, general and administrative 1,376 1,347 2,694 2,697 Total share-based compensation 1,759 1,796 3,476 3,533 Income tax benefit (249 ) (73 ) (322 ) (113 ) Total share-based compensation, net $ 1,510 $ 1,723 $ 3,154 $ 3,420 Income (Loss) Per Share Basic income (loss) per common share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding during the reporting period. Diluted income (loss) 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 (loss) 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 six June 24, 2017, 46,000 and 152,000 three six June 25, 2016, 773,000 and 775,000 The following table reconciles the denominators used in computing basic and diluted income (loss) per share ( in thousands) : Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Weighted average common shares 27,708 26,711 27,343 26,514 Effect of dilutive securities 1,017 674 1,145 876 28,725 27,385 28,488 27,390 Cohu has utilized the “control number” concept in the computation of diluted earnings per share to determine whether potential common stock instruments are dilutive. The control number used is income from continuing operations. The control number concept requires that the same number of potentially dilutive securities applied in computing diluted earnings per share from continuing operations be applied to all other categories of income or loss, regardless of their anti-dilutive effect on such categories. 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 there is persuasive evidence of an arrangement, title and risk of loss have passed, delivery has occurred or the services have been rendered, the sales price is fixed or determinable and collection of the related receivable is reasonably assured. Title and risk of loss generally pass to our customers upon shipment. In circumstances where either title or risk of loss pass upon destination or acceptance, we defer revenue recognition until such events occur. Revenue for established products that have previously satisfied a customer ’s acceptance requirements and provide for full payment tied to shipment is generally recognized upon shipment and passage of title. In certain instances, customer payment terms may 20% 80% not Certain of our equipment sales are accounted for as multiple-element arrangements. A multiple-element arrangement is a transaction which may may For arrangements containing multiple elements, the revenue relating to the undelivered elements is deferred using the relative selling price method utilizing estimated sales prices until delivery of the deferred elements. We limit the amount of revenue recognition for delivered elements to the amount that is not On shipments where sales are not At June 24, 2017, 8.2 million and deferred profit of $6.3 million. At December 31, 2016, $9.3 $6.9 A small number of customers historically have been responsible for a significant portion of our net sales. Significant customer concentration information is as follows: Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Customers individually accounting for more than 10% of net sales one one one two Percentage of net sales 20.7% 21.7% 20.4% 32.0% Comprehensive Loss Our accumulated other comprehensive loss balance totaled approximately $20.6 million and $27.9 June 24, 2017 December 31, 2016, not and adjustments related to postretirement benefits. Reclassification adjustments from accumulated other comprehensive income during the first six 2017 2016 not 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 six 2017 2016 not Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements – In July 2015, No. 2015 11, Simplifying the Measurement of Inventory The adoption of this authoritative guidance did not Recently Issued Accounting Pronouncements – In March 2017, No. 2017 07, Compensation – Retirement Benefits (Topic 715 December 15, 2017, not In January 2017, No. 2017 04, Simplifying the Test for Goodwill Impairment 2 not December 15, 2019. not In January 2017, No. 2017 01, Clarifying the Definition of a Business. December 15, 2017. not In November 2016, No. 2016 18, Restricted Cash. December 15, 2017. not In August 2016, No. 2016 15, Classification of Certain Cash Receipts and Cash Payments. eight December 15, 2017. not In February 2016, No. 2016 02, Leases (Topic 842 December 15, 2018. In May 2014, No. 2014 09, Revenue from Contracts with Customers (Topic 606 (ASU 2014 09 August 2015, No. 2015 14, Revenue from Contracts with Customers (Topic 606 2014 09 one March 2016, No. 2016 08, Revenue from Contracts with Customers (Topic 606 2016 08 first 2018. December 31, 2017, first 2018 two retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective method). We currently anticipate adopting the standard using the modified retrospective method. We are still in the process of completing our analysis on the impact this guidance will have on our consolidated financial statements and related disclosures. Based on our preliminary review of our customer agreements, we currently expect that our revenue will continue to be recognized at a point in time, generally upon shipment of products to customers, consistent with our current revenue recognition model. In certain instances, when customer payment terms provide that a minority portion (e.g. up to 20% may

Note 2 - Business Acquisitions,

Note 2 - Business Acquisitions, Goodwill and Other Purchased Intangible Assets	6 Months Ended
	Jun. 24, 2017
Notes to Financial Statements
Business Combination, Goodwill, and Intangible Assets Disclosure [Text Block]	2 . Business Acquisitions, Goodwill and Other Purchased Intangible Assets Kita On January 4, 2017, first six June 24, 2017 June 25, 2016 $0.2 million and $0.4 The Acquisition has been accounted for in conformity with FASB Accounting Standards Codification 805, Business Combinations 805” ( in thousands ): Cash paid to Kita shareholders $ 15,000 Fair value of contingent consideration 2,251 Total purchase price $ 17,251 The contingent consideration represents the estimated fair value of future payments totaling up to $3.0 million we would be required to make as a result of Kita achieving annual revenue and EBITDA targets in 2017 2018 3 3 three We have not not 12 not including an amount for goodwill representing the difference between the Acquisition consideration and the fair value of the identifiable net assets. The table below summarizes the assets acquired and liabilities assumed as of January 4, 2017 ( in thousands Current assets, including cash received $ 10,310 Property, plant and equipment 12,751 Other assets 2,291 Intangible assets subject to amortization 2,000 Goodwill 4,821 Total assets acquired 32,173 Liabilities assumed (14,922 ) Net assets acquired $ 17,251 The preliminary allocation of the intangible assets subject to amortization is as follows (in thousands) : Average Description Estimated Fair Value Useful Life (years) Developed technology $ 800 8 Customer relationships 600 4 Product backlog 100 1 Trade names 500 5 $ 2,000 The preliminary value assigned to the developed technology was determined by using the multi-period excess earnings method under the income approach. Developed technology, which comprises products that have reached technological feasibility, includes the products in Kita ’s product line. The revenue estimates used to value the developed technology were based on estimates of relevant market sizes and growth factors, expected trends in technology and the nature and expected timing of new product introductions by Kita and its competitors. The estimated cash flows were based on revenues for the developed technology net of operating expenses and net of contributory asset charges. The discount rate utilized to discount the net cash flows of the developed technology to present value was based on the risk associated with the respective cash flows taking into consideration the perceived risk of the technology relative to the other acquired assets, the weighted average cost of capital, the internal rate of return, and the weighted average return on assets. The value assigned to customer relationships was determined by using the with and without method under the income approach, which analyzes the difference in discounted cash flows generated with the customer relationships in place compared to the discounted cash flows generated without the customer relationships in place. The value assigned to backlog acquired was estimated based upon the contractual nature of the backlog as of the acquisition date, using the income approach to discount back to present value the cash flows attributable to the backlog. The value assigned to trade names was estimated using the relief-from-royalty method of the income approach. This approach is based on the assumption that in lieu of ownership, a company would be willing to pay a royalty in order to exploit the related benefits of this intangible asset. Kita ’s results of operations were included in, but not January 4, 2017 three six June 24, 2017 $5.0 $9.1 three - and six June 25, 2016 $4.3 $8.6 Goodwill and Intangible Assets Changes in the carrying value of goodwill during the year ended December 31, 2016 six June 24, 2017 ( in thousands Goodwill Balance, December 26, 2015 $ 60,264 Impact of currency exchange (1,415 ) Balance, December 31, 2016 58,849 Additions, net 4,821 Impact of currency exchange 2,368 Balance, June 24, 2017 $ 66,038 Purchased intangible assets, subject to amortization are as follows ( in thousands : June 24, 2017 December 31, 2016 Remaining Weighted Gross Average Gross Carrying Accum. Amort. Carrying Accum. Amount Amort. Period (years) Amount Amort. Developed technology $ 21,009 $ 11,396 3.9 $ 19,195 $ 9,597 Customer relationships 7,983 4,348 3.6 6,996 3,644 Trade names 6,176 734 12.5 5,353 468 Backlog 105 53 0.5 - - Total intangible assets $ 35,273 $ 16,531 $ 31,544 $ 13,709 Amortization expense related to intangible assets was approximately $1.0 million in the second 2017 $2.1 first six 2017. $1.8 second 2016 $3.6 first six 2016.

Note 3 - Financial Instruments

Note 3 - Financial Instruments Measured at Fair Value	6 Months Ended
	Jun. 24, 2017
Notes to Financial Statements
Fair Value, Measurement Inputs, Disclosure [Text Block]	3. Financial Instruments Measured at Fair Value Our cash, cash equivalents, and short-term investments consisted primarily of cash and other investment grade securities. We do not 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 not Investments that we have classified as short-term, by security type, are as follows ( in thousands ) June 24, 2017 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses (1) Value Corporate debt securities (2) $ 13,707 $ 1 $ 4 $ 13,704 U.S. Treasury securities 5,197 - 1 5,196 Bank certificates of deposit 1,294 - - 1,294 Government-sponsored 1,000 - - 1,000 Foreign government security 616 - - 616 $ 21,814 $ 1 $ 5 $ 21,810 December 31, 2016 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses (1) Value Corporate debt securities (2) $ 22,513 $ 1 $ 6 $ 22,508 Government-sponsored 8,109 - 1 8,108 Bank certificates of deposit 750 1 - 751 Foreign government security 623 - - 623 $ 31,995 $ 2 $ 7 $ 31,990 ( 1 As of June 24, 2017, $16.6 million of investments in our portfolio in a loss position. As of December 31, 2016, $26.6 ( 2 Corporate debt securities include investments in financial and other corporate institutions. No Effective maturities of short-term investments are as follows (in thousands) : June 24, 2017 December 31, 2016 Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value Due in one year or less $ 21,198 $ 21,194 $ 31,372 $ 31,367 Due after one year through three years 616 616 623 623 $ 21,814 $ 21,810 $ 31,995 $ 31,990 Accounting standards pertaining to fair value measurements establish a three 1, 2, 3, no 1. 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) : Fair value measurements at June 24, 2017 using: Total estimated Level 1 Level 2 Level 3 fair value Cash $ 73,734 $ - $ - $ 73,734 U.S. Treasury securities - 5,196 - 5,196 Corporate debt securities - 18,202 - 18,202 Government-sponsored enterprise securities - 1,000 - 1,000 Money market funds - 14,240 - 14,240 Bank certificates of deposit - 1,294 - 1,294 Foreign government security - 616 - 616 $ 73,734 $ 40,548 $ - $ 114,282 Fair value measurements at December 31, 2016 using: Total estimated Level 1 Level 2 Level 3 fair value Cash $ 70,279 $ - $ - $ 70,279 Foreign government security - 623 - 623 Corporate debt securities - 24,108 - 24,108 Government-sponsored enterprise securities - 8,108 - 8,108 Money market funds - 24,166 - 24,166 Bank certificates of deposit - 751 - 751 $ 70,279 $ 57,756 $ - $ 128,035

Note 4 - Employee Stock Benefit

Note 4 - Employee Stock Benefit Plans	6 Months Ended
	Jun. 24, 2017
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	4. Employee Stock Benefit Plans Our 2005 “2005 may not June 24, 2017, 1,458,782 shares available for future equity grants under the 2005 Stock Options Stock options may one four 2015 ten In the first six 2017 we did not we issued 612,388 At June 24, 2017, 1,028,779 stock options outstanding. These options had a weighted-average exercise price of $10.04 $7.0 3.8 At June 24, 2017, 1,015,863 stock options outstanding that were exercisable. These options had a weighted-average exercise price of $10.02 $6.9 3.8 Restricted Stock Units We grant restricted stock units (“RSUs”) to certain employees, consultants and directors. RSUs vest in annual increments that range from one four not not not June 24, 2017. In the first six 2017 339,956 392,624 June 24, 2017, 1,017,941 $17.1 2.5 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 2017 2016 25% 200% three 2015, two 2017 2016 100% third 2015 50% second third 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 June 24, 2017. In the first six 2017 , we awarded 185,305 and we issued 186,146 t June 24, 2017, 357,333 $6.0 1.9 Employee Stock Purchase Plan The Cohu, Inc. 1997 may 85 6 During the first six 2017, 61,313 639,171

Note 5 - Income Taxes

Note 5 - Income Taxes	6 Months Ended
	Jun. 24, 2017
Notes to Financial Statements
Income Tax Disclosure [Text Block]	5. Income Taxes For the three six June 24, 2017, we used the estimated effective tax rate (“ETR”) expected to be applicable for the full fiscal year in computing our tax provision. The ETR on income from continuing operations for the three June 24, 2017 June 25, 2016 , was 9.1% 23.2%, 12.2% 54.3% six June 24, 2017 June 25, 2016 , respectively. The tax provision on income from continuing operations in 2017 2016 Other than for foreign currency exchange rate changes and the Kita acquisition, there was no related accrued interest and penalties during the three six June 24, 2017 June 25, 2016.

Note 6 - Discontinued Operation

Note 6 - Discontinued Operations	6 Months Ended
	Jun. 24, 2017
Notes to Financial Statements
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	6. Discontinued Operations In June 2015, $4.9 million in cash and up to $2.5 no 3 3, three The contingent consideration represents the estimated fair value of future payments we are due from the buyer should BMS achieve specified annual revenue targets in certain years as specified in the sale agreement. The periodic fair value of the contingent consideration is determined through the use of the Monte Carlo simulation model. Based on updated information the contingent consideration receivable was adjusted in the second 2017 Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Net sales $ - $ - $ - $ - Operating loss before income taxes - - - - Loss from sale of BMS (278 ) (55 ) (278 ) (55 ) Loss before taxes (278 ) (55 ) (278 ) (55 ) Income tax provision - - - - Loss, net of tax $ (278 ) $ (55 ) $ (278 ) $ (55 )

Note 7 - Contingencies

Note 7 - Contingencies	6 Months Ended
	Jun. 24, 2017
Notes to Financial Statements
Contingencies Disclosure [Text Block]	7. Contingencies 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 not

Note 8 - Guarantees and Other O

Note 8 - Guarantees and Other Obligations	6 Months Ended
	Jun. 24, 2017
Notes to Financial Statements
Commitments Contingencies and Guarantees [Text Block]	8. Guarantees and Other Obligations Product Warranty Our products are generally sold with warranty periods that range from 12 36 Changes in accrued warranty were as follows ( in thousands : Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Balance at beginning of period $ 4,945 $ 5,218 $ 4,350 $ 4,886 Warranty expense accruals 1,990 1,446 3,726 3,266 Warranty payments (1,865 ) (1,546 ) (3,056 ) (3,034 ) Warranty liability assumed - - 50 - Balance at end of period $ 5,070 $ 5,118 $ 5,070 $ 5,118 Accrued warranty amounts expected to be incurred after one included in noncurrent other accrued liabilities in the condensed consolidated balance sheet. These amounts total $0.7 June 24, 2017 $0.6 December 31, 2016. Borrowings Revolving Lines of Credit As a result of the Acquisition, we assumed a series of revolving credit facilities with various financial institutions in Japan. The credit facilities renew monthly and provide Kita with access to working capital totaling up to $6.3 million. At June 24, 2017, $3.2 Term Loans As a result of the Acquisition we assumed certain term loans from a series of Japanese financial institutions that had an aggregate amount outstanding of $6.7 June 24, 2017 ’s facility in Osaka, Japan. The loans are collateralized by the facility and land, carry interest rates ranging from 0.05% 1.43%, 2034. June 24, 2017, $1.4 Lines of Credit We have two one 2.5 million Swiss Francs. At June 24, 2017 December 31, 2016, no Standby Letters of Credit During the ordinary course of business, from time-to-time we provide standby letters of credit instruments to certain parties as required. As of June 24, 2017, no

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 24, 2017
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation Our fiscal years are based on a 52 53 December. December 31, 2016 dated financial statements as of June 24, 2017 ( second 2017” first six 2017” June 25, 2016 ( second 2016” first six 2016” three six June 24, 2017 comprised of 13 25 three six June 25, 2016 comprised of 13 26 Our interim results are not 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 31, 2016, 2016 10 Certain prior year amounts have been restated as a result of our early adoption of Accounting Standards Update (“ASU”) No. 2016 09, 718 Improvements to Employee Share-Based Payment Accounting 2016 09 2016 09 December 15, 2016, 2016 09 fourth 2016. As part of our adoption of ASU 2016 09 three six June 25, 2016 $0.1 $0.1
Discontinued Operations, Policy [Policy Text Block]	Discontinued Operations In June 2015, 6,
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 Trade accounts receivable are presented net of allowance for doubtful accounts of $0.1 million at both June 24, 2017 December 31, 2016. June 24, 2017, may
Segment Reporting, Policy [Policy Text Block]	Segment Information We applied the provisions of ASC Topic 280, Segment Reporting 280” 280, 280 one
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 first second We conduct our annual impairment test as of October 1st no October 1, 2016 may June 24, 2017, not may 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 may not ’s carrying amount is not
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign 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. During the three six June 24, 2017, we recognized foreign exchange losses of $1.2 $2.5 three six ended June 25, 2016, $0.3 $0.8 Cumulative translation adjustments resulting from the translation of the financial statements are included as a separate component of stockholders’ equity.
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) : Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Cost of sales $ 121 $ 115 $ 204 $ 208 Research and development 262 334 578 628 Selling, general and administrative 1,376 1,347 2,694 2,697 Total share-based compensation 1,759 1,796 3,476 3,533 Income tax benefit (249 ) (73 ) (322 ) (113 ) Total share-based compensation, net $ 1,510 $ 1,723 $ 3,154 $ 3,420
Earnings Per Share, Policy [Policy Text Block]	Income (Loss) Per Share Basic income (loss) per common share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding during the reporting period. Diluted income (loss) 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 (loss) 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 six June 24, 2017, 46,000 and 152,000 three six June 25, 2016, 773,000 and 775,000 The following table reconciles the denominators used in computing basic and diluted income (loss) per share ( in thousands) : Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Weighted average common shares 27,708 26,711 27,343 26,514 Effect of dilutive securities 1,017 674 1,145 876 28,725 27,385 28,488 27,390 Cohu has utilized the “control number” concept in the computation of diluted earnings per share to determine whether potential common stock instruments are dilutive. The control number used is income from continuing operations. The control number concept requires that the same number of potentially dilutive securities applied in computing diluted earnings per share from continuing operations be applied to all other categories of income or loss, regardless of their anti-dilutive effect on such categories.
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 there is persuasive evidence of an arrangement, title and risk of loss have passed, delivery has occurred or the services have been rendered, the sales price is fixed or determinable and collection of the related receivable is reasonably assured. Title and risk of loss generally pass to our customers upon shipment. In circumstances where either title or risk of loss pass upon destination or acceptance, we defer revenue recognition until such events occur. Revenue for established products that have previously satisfied a customer ’s acceptance requirements and provide for full payment tied to shipment is generally recognized upon shipment and passage of title. In certain instances, customer payment terms may 20% 80% not Certain of our equipment sales are accounted for as multiple-element arrangements. A multiple-element arrangement is a transaction which may may For arrangements containing multiple elements, the revenue relating to the undelivered elements is deferred using the relative selling price method utilizing estimated sales prices until delivery of the deferred elements. We limit the amount of revenue recognition for delivered elements to the amount that is not On shipments where sales are not At June 24, 2017, 8.2 million and deferred profit of $6.3 million. At December 31, 2016, $9.3 $6.9 A small number of customers historically have been responsible for a significant portion of our net sales. Significant customer concentration information is as follows: Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Customers individually accounting for more than 10% of net sales one one one two Percentage of net sales 20.7% 21.7% 20.4% 32.0%
Comprehensive Income, Policy [Policy Text Block]	Comprehensive Loss Our accumulated other comprehensive loss balance totaled approximately $20.6 million and $27.9 June 24, 2017 December 31, 2016, not and adjustments related to postretirement benefits. Reclassification adjustments from accumulated other comprehensive income during the first six 2017 2016 not
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 six 2017 2016 not
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements – In July 2015, No. 2015 11, Simplifying the Measurement of Inventory The adoption of this authoritative guidance did not Recently Issued Accounting Pronouncements – In March 2017, No. 2017 07, Compensation – Retirement Benefits (Topic 715 December 15, 2017, not In January 2017, No. 2017 04, Simplifying the Test for Goodwill Impairment 2 not December 15, 2019. not In January 2017, No. 2017 01, Clarifying the Definition of a Business. December 15, 2017. not In November 2016, No. 2016 18, Restricted Cash. December 15, 2017. not In August 2016, No. 2016 15, Classification of Certain Cash Receipts and Cash Payments. eight December 15, 2017. not In February 2016, No. 2016 02, Leases (Topic 842 December 15, 2018. In May 2014, No. 2014 09, Revenue from Contracts with Customers (Topic 606 (ASU 2014 09 August 2015, No. 2015 14, Revenue from Contracts with Customers (Topic 606 2014 09 one March 2016, No. 2016 08, Revenue from Contracts with Customers (Topic 606 2016 08 first 2018. December 31, 2017, first 2018 two retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective method). We currently anticipate adopting the standard using the modified retrospective method. We are still in the process of completing our analysis on the impact this guidance will have on our consolidated financial statements and related disclosures. Based on our preliminary review of our customer agreements, we currently expect that our revenue will continue to be recognized at a point in time, generally upon shipment of products to customers, consistent with our current revenue recognition model. In certain instances, when customer payment terms provide that a minority portion (e.g. up to 20% may

Note 1 - Summary of Significa16

Note 1 - Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 24, 2017
Notes Tables
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Cost of sales $ 121 $ 115 $ 204 $ 208 Research and development 262 334 578 628 Selling, general and administrative 1,376 1,347 2,694 2,697 Total share-based compensation 1,759 1,796 3,476 3,533 Income tax benefit (249 ) (73 ) (322 ) (113 ) Total share-based compensation, net $ 1,510 $ 1,723 $ 3,154 $ 3,420
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Weighted average common shares 27,708 26,711 27,343 26,514 Effect of dilutive securities 1,017 674 1,145 876 28,725 27,385 28,488 27,390
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Customers individually accounting for more than 10% of net sales one one one two Percentage of net sales 20.7% 21.7% 20.4% 32.0%

Note 2 - Business Acquisition17

Note 2 - Business Acquisitions, Goodwill and Other Purchased Intangible Assets (Tables)	6 Months Ended
	Jun. 24, 2017
Notes Tables
Schedule of Goodwill [Table Text Block]	Goodwill Balance, December 26, 2015 $ 60,264 Impact of currency exchange (1,415 ) Balance, December 31, 2016 58,849 Additions, net 4,821 Impact of currency exchange 2,368 Balance, June 24, 2017 $ 66,038
Schedule of Finite-Lived Intangible Assets [Table Text Block]	June 24, 2017 December 31, 2016 Remaining Weighted Gross Average Gross Carrying Accum. Amort. Carrying Accum. Amount Amort. Period (years) Amount Amort. Developed technology $ 21,009 $ 11,396 3.9 $ 19,195 $ 9,597 Customer relationships 7,983 4,348 3.6 6,996 3,644 Trade names 6,176 734 12.5 5,353 468 Backlog 105 53 0.5 - - Total intangible assets $ 35,273 $ 16,531 $ 31,544 $ 13,709
Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member]
Notes Tables
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	Cash paid to Kita shareholders $ 15,000 Fair value of contingent consideration 2,251 Total purchase price $ 17,251
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	Current assets, including cash received $ 10,310 Property, plant and equipment 12,751 Other assets 2,291 Intangible assets subject to amortization 2,000 Goodwill 4,821 Total assets acquired 32,173 Liabilities assumed (14,922 ) Net assets acquired $ 17,251
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	Average Description Estimated Fair Value Useful Life (years) Developed technology $ 800 8 Customer relationships 600 4 Product backlog 100 1 Trade names 500 5 $ 2,000

Note 3 - Financial Instrument18

Note 3 - Financial Instruments Measured at Fair Value (Tables)	6 Months Ended
	Jun. 24, 2017
Notes Tables
Available-for-sale Securities [Table Text Block]	June 24, 2017 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses (1) Value Corporate debt securities (2) $ 13,707 $ 1 $ 4 $ 13,704 U.S. Treasury securities 5,197 - 1 5,196 Bank certificates of deposit 1,294 - - 1,294 Government-sponsored 1,000 - - 1,000 Foreign government security 616 - - 616 $ 21,814 $ 1 $ 5 $ 21,810 December 31, 2016 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses (1) Value Corporate debt securities (2) $ 22,513 $ 1 $ 6 $ 22,508 Government-sponsored 8,109 - 1 8,108 Bank certificates of deposit 750 1 - 751 Foreign government security 623 - - 623 $ 31,995 $ 2 $ 7 $ 31,990
Investments Classified by Contractual Maturity Date [Table Text Block]	June 24, 2017 December 31, 2016 Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value Due in one year or less $ 21,198 $ 21,194 $ 31,372 $ 31,367 Due after one year through three years 616 616 623 623 $ 21,814 $ 21,810 $ 31,995 $ 31,990
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	Fair value measurements at June 24, 2017 using: Total estimated Level 1 Level 2 Level 3 fair value Cash $ 73,734 $ - $ - $ 73,734 U.S. Treasury securities - 5,196 - 5,196 Corporate debt securities - 18,202 - 18,202 Government-sponsored enterprise securities - 1,000 - 1,000 Money market funds - 14,240 - 14,240 Bank certificates of deposit - 1,294 - 1,294 Foreign government security - 616 - 616 $ 73,734 $ 40,548 $ - $ 114,282 Fair value measurements at December 31, 2016 using: Total estimated Level 1 Level 2 Level 3 fair value Cash $ 70,279 $ - $ - $ 70,279 Foreign government security - 623 - 623 Corporate debt securities - 24,108 - 24,108 Government-sponsored enterprise securities - 8,108 - 8,108 Money market funds - 24,166 - 24,166 Bank certificates of deposit - 751 - 751 $ 70,279 $ 57,756 $ - $ 128,035

Note 6 - Discontinued Operati19

Note 6 - Discontinued Operations (Tables)	6 Months Ended
	Jun. 24, 2017
Notes Tables
Disposal Groups, Including Discontinued Operations [Table Text Block]	Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Net sales $ - $ - $ - $ - Operating loss before income taxes - - - - Loss from sale of BMS (278 ) (55 ) (278 ) (55 ) Loss before taxes (278 ) (55 ) (278 ) (55 ) Income tax provision - - - - Loss, net of tax $ (278 ) $ (55 ) $ (278 ) $ (55 )

Note 8 - Guarantees and Other20

Note 8 - Guarantees and Other Obligations (Tables)	6 Months Ended
	Jun. 24, 2017
Notes Tables
Schedule of Product Warranty Liability [Table Text Block]	Three Months Ended Six Months Ended June 24, June 25, June 24, June 25, 2017 2016 2017 2016 Balance at beginning of period $ 4,945 $ 5,218 $ 4,350 $ 4,886 Warranty expense accruals 1,990 1,446 3,726 3,266 Warranty payments (1,865 ) (1,546 ) (3,056 ) (3,034 ) Warranty liability assumed - - 50 - Balance at end of period $ 5,070 $ 5,118 $ 5,070 $ 5,118

Note 1 - Summary of Significa21

Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	Oct. 01, 2016	Jun. 24, 2017	Jun. 25, 2016	Jun. 24, 2017	Jun. 25, 2016	Dec. 31, 2016
Allowance for Doubtful Accounts Receivable, Current		$ 100		$ 100		$ 100
Number of Operating Segments				1
Goodwill and Intangible Asset Impairment	$ 0
Foreign Currency Transaction Gain (Loss), Realized		(1,200)	$ (300)	$ (2,500)	$ (800)
Percentage of Revenue Recognized upon Customer Acceptance				20.00%
Percentage of Revenue Recognized upon Shipment and Passage of Title				80.00%
Other Deferred Credits, Current		6,300		$ 6,300		6,900
Deferred Revenue		8,200		8,200		9,300
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (20,604)		$ (20,604)		$ (27,882)
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		46,000	773,000	152,000	775,000
Adjustments for New Accounting Principle, Early Adoption [Member] | Three Months Ended June 25, 2016 [Member]
Prior Period Reclassification Adjustment			$ 100
Adjustments for New Accounting Principle, Early Adoption [Member] | Six Months Ended June 25, 2016 [Member]
Prior Period Reclassification Adjustment					$ (100)

Note 1 - Summary of Significa22

Note 1 - Summary of Significant Accounting Policies - Reported Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 24, 2017	Jun. 25, 2016	Jun. 24, 2017	Jun. 25, 2016
Allocated share-based compensation	$ 1,759	$ 1,796	$ 3,476	$ 3,533
Income tax benefit	(249)	(73)	(322)	(113)
Total share-based compensation, net	1,510	1,723	3,154	3,420
Cost of Sales [Member]
Allocated share-based compensation	121	115	204	208
Research and Development Expense [Member]
Allocated share-based compensation	262	334	578	628
Selling, General and Administrative Expenses [Member]
Allocated share-based compensation	$ 1,376	$ 1,347	$ 2,694	$ 2,697

Note 1 - Summary of Significa23

Note 1 - Summary of Significant Accounting Policies - Computation of Basic and Diluted Income (Loss) Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 24, 2017	Jun. 25, 2016	Jun. 24, 2017	Jun. 25, 2016
Weighted average common shares (in shares)	27,708	26,711	27,343	26,514
Effect of dilutive securities (in shares)	1,017	674	1,145	876
(in shares)	28,725	27,385	28,488	27,390

Note 1 - Summary of Significa24

Note 1 - Summary of Significant Accounting Policies - Customer Concentration (Details) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member]	3 Months Ended		6 Months Ended
	Jun. 24, 2017	Jun. 25, 2016	Jun. 24, 2017	Jun. 25, 2016
Customers individually accounting for more than 10% of net sales	1	1	1	2
One Customer [Member]
Percentage of net sales	20.70%	21.70%	20.40%
Two Customers [Member]
Percentage of net sales				32.00%

Note 2 - Business Acquisition25

Note 2 - Business Acquisitions, Goodwill and Other Purchased Intangible Assets (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 24, 2017	Jun. 25, 2016	Jun. 24, 2017	Jun. 25, 2016
Amortization of Intangible Assets	$ 1	$ 1.8	$ 2.1	$ 3.6
Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member]
Revenues		$ 4.3		8.6
Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	3		3
Revenues	$ 5		9.1
Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] | Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs			$ 0.2	$ 0.4

Note 2 - Business Acquisition26

Note 2 - Business Acquisitions, Goodwill and Other Purchased Intangible Assets - Total Purchase Price (Details) - Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] $ in Thousands	Jan. 04, 2017USD ($)
Cash paid to Kita shareholders	$ 15,000
Fair value of contingent consideration	2,251
Total purchase price	$ 17,251

Note 2 - Business Acquisition27

Note 2 - Business Acquisitions, Goodwill and Other Purchased Intangible Assets - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jun. 24, 2017	Jan. 04, 2017	Dec. 31, 2016	[1]	Dec. 26, 2015
Goodwill	$ 66,038		$ 58,849		$ 60,264
Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member]
Current assets, including cash received		$ 10,310
Property, plant and equipment		12,751
Other assets		2,291
Intangible assets subject to amortization		2,000
Goodwill		4,821
Total assets acquired		32,173
Liabilities assumed		(14,922)
Net assets acquired		$ 17,251
[1]	Derived from December 31, 2016 audited financial statements

Note 2 - Business Acquisition28

Note 2 - Business Acquisitions, Goodwill and Other Purchased Intangible Assets - Preliminary Allocation of Intangible Assets (Details) - Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] $ in Millions	Jan. 04, 2017USD ($)
Finite-lived intangible assets, estimated fair value	$ 2
Developed Technology Rights [Member]
Finite-lived intangible assets, estimated fair value	$ 0.8
Finite-lived intangible assets, average useful life (Year)	8 years
Customer Relationships [Member]
Finite-lived intangible assets, estimated fair value	$ 0.6
Finite-lived intangible assets, average useful life (Year)	4 years
Order or Production Backlog [Member]
Finite-lived intangible assets, estimated fair value	$ 0.1
Finite-lived intangible assets, average useful life (Year)	1 year
Trade Names [Member]
Finite-lived intangible assets, estimated fair value	$ 0.5
Finite-lived intangible assets, average useful life (Year)	5 years

Note 2 - Business Acquisition29

Note 2 - Business Acquisitions, Goodwill and Other Purchased Intangible Assets - Changes in Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 24, 2017		Dec. 31, 2016
Beginning balance	$ 58,849	[1]	$ 60,264
Additions, net	4,821
Impact of currency exchange	2,368		(1,415)
Ending balance	$ 66,038		$ 58,849	[1]
[1]	Derived from December 31, 2016 audited financial statements

Note 2 - Business Acquisition30

Note 2 - Business Acquisitions, Goodwill and Other Purchased Intangible Assets - Purchased Intangible Assets, Subject to Amortization (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 24, 2017	Dec. 31, 2016
Accumulated Amortization	$ 16,531	$ 13,709
Gross Carrying Amount	35,273	31,544
Developed Technology Rights [Member]
Accumulated Amortization	$ 11,396	9,597
Remaining Useful Life (Year)	3 years 328 days
Gross Carrying Amount	$ 21,009	19,195
Customer Relationships [Member]
Accumulated Amortization	$ 4,348	3,644
Remaining Useful Life (Year)	3 years 219 days
Gross Carrying Amount	$ 7,983	6,996
Trade Names [Member]
Accumulated Amortization	$ 734	468
Remaining Useful Life (Year)	12 years 182 days
Gross Carrying Amount	$ 6,176	5,353
Order or Production Backlog [Member]
Accumulated Amortization	$ 53
Remaining Useful Life (Year)	182 days
Gross Carrying Amount	$ 105

Note 3 - Financial Instrument31

Note 3 - Financial Instruments Measured at Fair Value (Details Textual) - USD ($) $ in Millions	Jun. 24, 2017	Dec. 31, 2016
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 16.6	$ 26.6

Note 3 - Financial Instrument32

Note 3 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details) - USD ($) $ in Thousands		Jun. 24, 2017	Dec. 31, 2016
Gross Unrealized Gains		$ 1	$ 2
Gross Unrealized Losses	[1]	5	7
Short-term investments		21,810	31,990	[2]
Amortized Cost		21,814	31,995
Corporate Debt Securities [Member]
Gross Unrealized Gains	[3]	1	1
Gross Unrealized Losses	[1],[3]	4	6
Short-term investments	[3]	13,704	22,508
Amortized Cost	[3]	13,707	22,513
US Government-sponsored Enterprises Debt Securities [Member]
Gross Unrealized Gains
Gross Unrealized Losses	[1]		1
Short-term investments		1,000	8,108
Amortized Cost		1,000	8,109
US Treasury Securities [Member]
Gross Unrealized Gains
Gross Unrealized Losses	[1]	1
Short-term investments		5,196
Amortized Cost		5,197
Certificates of Deposit [Member]
Gross Unrealized Gains			1
Gross Unrealized Losses	[1]
Short-term investments		1,294	751
Amortized Cost		1,294	750
Foreign Government Debt Securities [Member]
Gross Unrealized Gains
Gross Unrealized Losses	[1]
Short-term investments		616	623
Amortized Cost		$ 616	$ 623
[1]	As of June 24, 2017 there were $16.6 million of investments in our portfolio in a loss position. As of December 31, 2016 the cost and fair value of investments with loss positions were approximately $26.6 million. We evaluated the nature of these investments, credit worthiness of the issuer and the duration of these impairments to determine if an other-than-temporary decline in fair value had occurred and concluded that these losses were temporary and we have the ability and intent to hold these investments to maturity.
[2]	Derived from December 31, 2016 audited financial statements
[3]	Corporate debt securities include investments in financial and other corporate institutions. No single issuer represents a significant portion of the total corporate debt securities portfolio.

Note 3 - Financial Instrument33

Note 3 - Financial Instruments Measured at Fair Value - Effective Maturities of Short-term Investments (Details) - USD ($) $ in Thousands	Jun. 24, 2017	Dec. 31, 2016
Due in one year or less, amortized cost	$ 21,198	$ 31,372
Due in one year or less, estimated fair value	21,194	31,367
Due after one year through three years, amortized cost	616	623
Due after one year through three years, estimated fair value	616	623
Total amortized cost	21,814	31,995
Total estimated fair value	$ 21,810	$ 31,990

Note 3 - Financial Instrument34

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	Jun. 24, 2017	Dec. 31, 2016
	$ 114,282	$ 128,035
US Treasury Securities [Member]
Short-term investments	5,196
Foreign Government Debt Securities [Member]
Short-term investments	616	623
Corporate Debt Securities [Member]
Short-term investments	18,202	24,108
US Government-sponsored Enterprises Debt Securities [Member]
Short-term investments	1,000	8,108
Certificates of Deposit [Member]
Short-term investments	1,294	751
Cash [Member]
Cash and cash equivalents	73,734	70,279
Money Market Funds [Member]
Cash and cash equivalents	14,240	24,166
Fair Value, Inputs, Level 1 [Member]
	73,734	70,279
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Short-term investments
Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt 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] | Cash [Member]
Cash and cash equivalents	73,734	70,279
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Cash and cash equivalents
Fair Value, Inputs, Level 2 [Member]
	40,548	57,756
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Short-term investments	5,196
Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member]
Short-term investments	616	623
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Short-term investments	18,202	24,108
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Short-term investments	1,000	8,108
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Short-term investments	1,294	751
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	14,240	24,166
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] | Foreign Government Debt 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] | Cash [Member]
Cash and cash equivalents
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Cash and cash equivalents

Note 4 - Employee Stock Benef35

Note 4 - Employee Stock Benefit Plans (Details Textual) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 24, 2017USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,028,779
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 10.04
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $	$ 7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,015,863
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 10.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $	$ 6.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,458,782
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	612,388
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans	61,313
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	639,171
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Employee Stock Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Employee Stock Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	339,956
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	392,624
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,017,941
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $	$ 17.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	2 years 182 days
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Equity Based Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	185,305
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	186,146
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	357,333
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $	$ 6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	1 year 328 days
Equity Based Performance Stock Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Available for Issue	25.00%
Equity Based Performance Stock Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Available for Issue	200.00%
Equity-based Performance Stock Units Granted in 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 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, Award Vesting 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%

Note 5 - Income Taxes (Details

Note 5 - Income Taxes (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 24, 2017	Jun. 25, 2016	Jun. 24, 2017	Jun. 25, 2016
Effective Income Tax Rate Reconciliation, Percent	9.10%	23.20%	12.20%	54.30%

Note 6 - Discontinued Operati37

Note 6 - Discontinued Operations (Details Textual) - Broadcast Microwave Services, Inc. (“BMS”) [Member] $ in Millions	1 Months Ended
	Jun. 30, 2015USD ($)
Proceeds from Divestiture of Businesses	$ 4.9
Disposal Group, Including Discontinued Operation, Contingent Consideration	$ 2.5

Note 6 - Discontinued Operati38

Note 6 - Discontinued Operations - Summary of Operating Results (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 24, 2017	Jun. 25, 2016	Jun. 24, 2017	Jun. 25, 2016
Loss, net of tax	$ (278)	$ (55)	$ (278)	$ (55)
Broadcast Microwave Services, Inc. (“BMS”) [Member]
Net sales
Operating loss before income taxes
Gain (loss) from disposal of segment	(278)	(55)	(278)	(55)
Loss before taxes	(278)	(55)	(278)	(55)
Income tax provision
Loss, net of tax	$ (278)	$ (55)	$ (278)	$ (55)

Note 8 - Guarantees and Other39

Note 8 - Guarantees and Other Obligations (Details Textual) $ in Thousands, SFr in Millions	6 Months Ended
	Jun. 24, 2017USD ($)	Jun. 24, 2017CHF (SFr)	Dec. 31, 2016USD ($)
Long-term Line of Credit	$ 0		$ 0
Loans Payable to Bank	6,700
Loans Payable to Bank, Current	1,409			[1]
Line of Credit Facility, Maximum Borrowing Capacity | SFr		SFr 2.5
Revolving Credit Facility [Member]
Long-term Line of Credit	3,200
Line of Credit Facility, Maximum Borrowing Capacity	6,300
Standby Letters of Credit [Member]
Long-term Line of Credit	0
Non-current Other Accrued Liabilities [Member]
Product Warranty Accrual, Noncurrent	$ 700		$ 600
Minimum [Member]
Standard Product Warranty Term	1 year
Minimum [Member] | Long-term Borrowings Assumed in Business Acquisition [Member] | Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member]
Debt Instrument, Interest Rate, Stated Percentage	0.05%	0.05%
Maximum [Member]
Standard Product Warranty Term	3 years
Maximum [Member] | Long-term Borrowings Assumed in Business Acquisition [Member] | Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member]
Debt Instrument, Interest Rate, Stated Percentage	1.43%	1.43%
[1]	Derived from December 31, 2016 audited financial statements

Note 8 - Guarantees and Other40

Note 8 - Guarantees and Other Obligations - Changes in Accrued Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 24, 2017	Jun. 25, 2016	Jun. 24, 2017	Jun. 25, 2016
Balance at beginning of period	$ 4,945	$ 5,218	$ 4,350	$ 4,886
Warranty expense accruals	1,990	1,446	3,726	3,266
Warranty payments	(1,865)	(1,546)	(3,056)	(3,034)
Warranty liability assumed			50
Balance at end of period	$ 5,070	$ 5,118	$ 5,070	$ 5,118