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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. 27, 2025
Dec. 28, 2024
Accumulated benefit obligation at beginning of year $ (1,592) $ (1,651)
Interest cost (82) (75)
Actuarial gain (loss) (211) 25
Benefits paid 118 109
Accumulated benefit obligation at end of year (1,767) (1,592)
Plan assets at end of year 0 0
Funded status $ (1,767) $ (1,592)