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. 30, 2023	Dec. 31, 2022
Accumulated benefit obligation at beginning of year	$ (1,657)	$ (2,097)
Interest cost	(78)	(51)
Actuarial (gain) loss	(6)	382
Benefits paid	90	109
Accumulated benefit obligation at end of year	(1,651)	(1,657)
Plan assets at end of year	0	0
Funded status	$ (1,651)	$ (1,657)