Note F - Operating Leases - Supplemental Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Operating lease cost	$ 9,411	$ 8,988
Total lease cost	9,411	8,988
Operating cash flows from operating leases	10,410	8,656
ROU assets obtained in exchange for new operating lease liabilities	6,632	13,575
ROU assets obtained in exchange for new operating lease liabilities	$ 6,632	$ 13,575
Weighted-average remaining lease term—operating leases (Year)	3 years 1 month 17 days	3 years 10 months 6 days
Weighted-average discount rate—operating leases	3.55%	3.75%