Note 6 - Derivative Instruments - Fair Value of Derivative Instruments (Details) - Designated as Hedging Instrument [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 30, 2018
Derivative Asset, Fair Value	$ 828	$ 2,445
Derivative Liability, Fair Value	2,092
Foreign Exchange Forward [Member] | Other Current Assets [Member]
Derivative Asset, Fair Value	0	651
Foreign Exchange Forward [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivative Liability, Fair Value	115
Foreign Exchange Forward [Member] | Other Current Liabilities [Member]
Derivative Liability, Fair Value
Interest Rate Swap [Member] | Other Current Assets [Member]
Derivative Asset, Fair Value	828	1,794
Interest Rate Swap [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivative Liability, Fair Value	$ 1,977
Interest Rate Swap [Member] | Other Current Liabilities [Member]
Derivative Liability, Fair Value