Note 2 - Certain Significant Estimates - Inventory Valuation Reserves (Details) - SEC Schedule, 12-09, Reserve, Inventory [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Beginning balance	$ 748	$ 697	$ 786
Additions	1,083	446	831
Deductions	(263)	(395)	(920)
Ending balance	$ 1,568	$ 748	$ 697