Note 2 - Certain Significant Estimates - Customer Allowances (Details) - Reserve For Customer Allowances [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 25, 2021
Beginning balance	$ 1,641	$ 2,340	$ 2,296
Additions	10,792	11,627	12,930
Deductions	(10,762)	(12,326)	(12,886)
Ending balance	$ 1,671	$ 1,641	$ 2,340