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Note 9 - Retirement Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Service cost including administrative expenses $ 1,323 $ 1,591
Service cost including administrative expenses 2,912 2,942
Expected return on plan assets (4,820) (4,423)
Amortization of net loss 0 76
Expected return on plan assets 2 2
Amortization of net loss $ (583) $ 188