Note 3 - Revenue From Contracts With Customers - Contract Balance (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Contract assets, balance	$ 5,569	$ 9,143
Revenues recorded during the period	15,860	17,356
Transferred to Accounts receivable or collected	15,818	(20,930)
Transferred to Accounts receivable or collected	(15,818)	20,930
Contract assets, balance	5,611	5,569
Contract liabilities, balance	2,313	1,614
Accruals for estimated future stock rotation and scrap returns	5,976	5,763
Less: Release of accruals for recognized stock rotation and scrap returns	(5,221)	(5,064)
Contract liabilities, balance	$ 3,068	$ 2,313