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Note 10 - Retirement Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Oct. 01, 2022
Sep. 30, 2023
Oct. 01, 2022
Service cost including administration $ 1,737 $ 2,435 $ 3,473 $ 4,870
Interest cost 2,818 2,374 5,636 4,748
Expected return on plan assets (4,175) (4,026) (8,349) (8,051)
Amortization of prior service cost 19 23 38 46
Amortization of net loss 0 103 0 205
Net periodic benefit cost $ 399 $ 909 $ 798 $ 1,818