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Note 6 - Derivative Instruments - Fair Value of Derivative Instruments (Details) - Designated as Hedging Instrument [Member] - Cash Flow Hedging [Member] - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 30, 2018
Derivative Asset, Fair Value $ 39 $ 2,445
Derivative Liability, Fair Value 6,020 0
Foreign Exchange Forward [Member] | Other Current Assets [Member]    
Derivative Asset, Fair Value 39 651
Foreign Exchange Forward [Member] | Accounts Payable and Accrued Liabilities [Member]    
Derivative Liability, Fair Value 0  
Foreign Exchange Forward [Member] | Other Current Liabilities [Member]    
Derivative Liability, Fair Value   0
Interest Rate Swap [Member] | Other Current Assets [Member]    
Derivative Asset, Fair Value 0 1,794
Derivative Liability, Fair Value   $ 0
Interest Rate Swap [Member] | Accounts Payable and Accrued Liabilities [Member]    
Derivative Liability, Fair Value $ 6,020