Note 7 - Leases - Lease Balance Classifications Within the Consolidated Balance Sheets and Lease Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jan. 02, 2021
Balance	$ 22,178
Right-of-use assets obtained for new and modified lease contracts during the period	7,459
Amortization of right-of-use assets during the period	(3,291)	$ (2,976)
Adjustments for present value and foreign currency effects	84
Balance	26,430
Balance	23,055
Lease liabilities incurred for new lease contracts during the period	7,459
Accretion of lease liabilities	657
Operating cash used by payments on lease liabilities	(3,984)	$ (3,812)
Adjustments for present value and foreign currency effects	81
Balance	27,268
Long-term operating lease liabilities, net of current portion	22,457		$ 18,906
Accounts Payable and Accrued Liabilities [Member]
Less: Current portion of operating lease liabilities (included in Accrued expenses)	$ (4,811)