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Note 10 - Retirement Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Increase Decrease In Unfunded status | $ 138,600 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax | (59,800) |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax | (19,900) |  |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 348,914 | $ 202,485 | $ 233,112
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 103,166 | (46,325) |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 73,000 | $ 26,000 |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 7.25% | 7.25% |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 1,600 | $ 400 |

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