Note 2 - Certain Significant Estimates - Allowance for Doubtful Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 25, 2021
Beginning balance	$ 492	$ 457	$ 896
Additions	566	108	(408)
Deductions	(406)	(73)	(31)
Ending balance	$ 652	$ 492	$ 457