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Note 2 - Business Acquisitions (Details Textual)
$ in Millions
Oct. 01, 2018
USD ($)
shares
Secured Term Loan Facility [Member]  
Debt Instrument, Face Amount $ 350.0
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 $ 794.4
Business Combination, Number of Brands Acquired 4
Payments to Acquire Businesses, Gross $ 160.5
Xcerra [Member] | Fair Value Adjustment to Inventory [Member]  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value $ 19.6
Xcerra [Member] | Common Stock [Member]  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares 11,776,149
Xcerra [Member] | Cohu RSUs [Member]  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares 529,995
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Attributed to Pre-Merger Services $ 0.8