Note 13 - Employee Benefit Plans - Net Periodic Benefit Cost Recognized in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Selling, general and administrative expenses	$ 1	$ 1	$ 2	$ 2
Other expense (income), net	132	128	291	315
Total	133	129	293	317
Selling, General and Administrative Expenses [Member]
Selling, general and administrative expenses	$ 1	$ 1	$ 2	$ 2