Note 7 - Leases - Lease Balance Classifications Within the Consolidated Balance Sheets and Lease Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Jan. 02, 2021
Balance	$ 22,178
Right-of-use assets obtained for new and modified lease contracts during the period	7,550
Amortization of right-of-use assets during the period	(4,926)	$ (4,464)
Adjustments for present value and foreign currency effects	20
Balance	24,822
Balance	23,055
Lease liabilities incurred for new lease contracts during the period	7,550
Accretion of lease liabilities	988
Operating cash used by payments on lease liabilities	(5,786)	$ (5,786)
Adjustments for present value and foreign currency effects	14
Balance	25,821
Long-term operating lease liabilities, net of current portion	20,407		$ 18,906
Accounts Payable and Accrued Liabilities [Member]
Less: Current portion of operating lease liabilities (included in Accrued expenses)	$ (5,414)