Note 6 - Employee Benefit Plans - Net Periodic Benefit Cost of Swiss Plan (Details) - Swiss Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Service cost	$ 551	$ 954	$ 1,223
Interest cost	510	56	61
Expected return on assets	(331)	(128)	(128)
Settlements	(177)	(487)	72
Net periodic costs	$ 553	$ 395	$ 1,228