Note 6 - Employee Benefit Plans - Post-retirement Benefit Obligation to Funded Status and Liability (Details) - Postretirement Health Coverage [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Accumulated benefit obligation at beginning of year	$ (1,651)	$ (1,657)
Interest cost	(75)	(78)
Actuarial gain (loss)	25	(6)
Benefits paid	109	90
Accumulated benefit obligation at end of year	(1,592)	(1,651)
Plan assets at end of year	0	0
Funded status	$ (1,592)	$ (1,651)