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Note 9 - Retirement Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 28, 2024
Sep. 30, 2023
Service cost including administrative expenses $ 1,590 $ 1,737 $ 3,181 $ 3,473
Interest cost 2,941 2,818 5,883 5,636
Expected return on plan assets (4,422) (4,175) (8,845) (8,349)
Amortization of net loss 76 0 152 0
Amortization of prior service cost 3 19 5 38
Net periodic benefit cost $ 188 $ 399 $ 376 $ 798