Note 2 - Certain Significant Estimates - Customer Allowances (Details) - Reserve For Customer Allowances [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Beginning balance	$ 2,340	$ 2,296	$ 1,292
Additions	11,627	12,930	11,940
Deductions	(12,326)	(12,886)	(10,936)
Ending balance	$ 1,641	$ 2,340	$ 2,296