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Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Effective Income Tax Rate Reconciliation, Percent |  |  | 23.70% | 33.10% | 22.90%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  |  | 0.00% | 7.80% | 1.20%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  | 0.20% | 2.80% | 0.30%
Effective Income Tax Rate Reconciliation, Tax Credit, Federal, Percent |  |  | 3.30% |  |
Deferred Income Tax Liabilities, Net | $ 31,481 |  | $ 24,320 | $ 31,481 |
Tax Credit Carryforward, Valuation Allowance |  |  | 4,900 |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  |  | 13 | $ 9 |
Forecast [Member] |  |  |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | $ 500 |  |  |
California Franchise Tax Board [Member] |  |  |  |  |
Tax Credit Carryforward, Amount |  |  | 1,500 |  |
New York State Division of Taxation and Finance [Member] |  |  |  |  |
Tax Credit Carryforward, Amount |  |  | 1,300 |  |
Wisconsin Department of Revenue [Member] |  |  |  |  |
Tax Credit Carryforward, Amount |  |  | $ 2,100 |  |
State and Local Jurisdiction [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  | (3.00%) | 2.50% |
Valuation Allowance Against State Tax Credits [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent | 7.80% |  | 0.00% | 9.00% |

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