Note 7 - Leases - Lease Balance Classifications Within the Consolidated Balance Sheets and Lease Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020	Jan. 02, 2021
Balance	$ 22,178
Right-of-use assets obtained for new and modified lease contracts during the period	7,440
Amortization of right-of-use assets during the period	(1,628)	$ (1,494)
Adjustments for present value and foreign currency effects	16
Balance	28,006
Balance	23,055
Lease liabilities incurred for new lease contracts during the period	7,440
Accretion of lease liabilities	349
Operating cash used by payments on lease liabilities	(1,731)	$ (1,934)
Adjustments for present value and foreign currency effects	10
Balance	29,123
Long-term operating lease liabilities, net of current portion	23,539		$ 18,906
Accounts Payable and Accrued Liabilities [Member]
Less: Current portion of operating lease liabilities (included in Accrued expenses)	$ (5,584)