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Note 10 - Retirement Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 0 | $ 0 |
Increase Decrease In Unfunded status | (32,400) |  |
Defined Benefit Plan, Plan Assets, Period Increase (Decrease) |  | (2,500) |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) |  | 29,900 |
Defined Benefit Plan, Accumulated Benefit Obligation | 203,000 | 203,800 |
Defined Benefit Plan, Plan Assets, Amount | 323,061 | 293,121 | $ 288,949
Defined Benefit Plan, Benefit Obligation, Benefits Paid | $ 10,926 | $ 21,375 |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets | 6.95% | 6.55% | 6.15%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Change Due to Subsequent Interim Measurement, Weighted-Average Expected Long-Term Rate of Return on Plan Assets | 7.30% |  |
Defined Benefit Plan, Benefit Obligation | $ 214,919 | $ 217,388 | $ 236,507
Unfunded Deferred Compensation Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | 4,200 | 3,400 |
Employees’ Savings 401(k) Plan [Member] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 3,200 | 2,800 | $ 2,500
Diversified Mix of Return-seeking Investments [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 38.00% |  |
Fixed Income Investment [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 62.00% |  |
Lump Sum Payout [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | $ 10,200 |

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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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, used to determine net periodic benefit cost (credit) of defined benefit plan, in subsequent interim measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 + Details
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