Note 2 - Certain Significant Estimates - Inventory Valuation Reserves (Details) - SEC Schedule, 12-09, Reserve, Inventory [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 25, 2021
Beginning balance	$ 1,568	$ 748	$ 697
Additions	725	1,083	446
Deductions	(1,402)	(263)	(395)
Ending balance	$ 891	$ 1,568	$ 748