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Note 10 - Retirement Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Increase Decrease In Unfunded status | $ 58,400 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax | (60,900) |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax | $ (20,300) |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 3.69% | 4.14% |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | $ (100) |  |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | 202,485 | $ 233,112 | $ 212,844
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | (46,325) | 26,731 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 26,000 | 2,100 |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 256,400 | $ 231,200 |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 7.25% | 7.25% |
Defined Benefit Plan Actual Gain on Plan Assets | 19.90% |  |
Defined Benefit Plan, Assumed Gain on Plan Assets | 8.80% |  |
Defined Benefit Plan Common Stock Included in Plan Assets | $ 16,600 | $ 12,800 |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 400 | $ 1,400 |

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- Definition The assumed S&P 500 unaudited gain (excluding dividends) on plan assets. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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