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Note 2 - Business Acquisitions, Goodwill and Purchased Intangible Assets (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2018
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Dec. 29, 2018
Share Price $ 25.10          
Transfer From In-Process Technology to Developed Technology       $ 13,200    
Amortization of Intangible Assets, Total   $ 9,969 $ 1,024 29,975 $ 3,117  
Secured Term Loan Facility [Member]            
Debt Instrument, Face Amount $ 350,000          
Debt Instrument, Amortization, Percentage of Principal Amount 0.25%          
Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate 3.00%          
Xcerra [Member]            
Business Combination, Consideration Transferred, Total $ 794,400          
Payments to Acquire Businesses, Gross 160,500          
Business Combination, Acquisition Related Costs       400 $ 5,200  
Xcerra [Member] | In-process Technology [Member]            
Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance   $ 22,900   $ 22,900   $ 36,300
Xcerra [Member] | Fair Value Adjustment to Inventory [Member]            
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value $ 19,600          
Xcerra [Member] | Common Stock [Member]            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 11,776,149          
Xcerra [Member] | Cohu RSUs [Member]            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 529,995          
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Attributed to Pre-Merger Services $ 800