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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Effective Income Tax Rate Reconciliation, Percent |  |  | 24.30% | 23.70% | 33.10%
Change in valuation allowance |  |  | (2.10%) | (0.20%) | 7.80%
Deferred Income Tax Liabilities, Net | $ 32,282 |  | $ 32,282 | $ 24,320 |
Tax Credit Carryforward, Valuation Allowance | 3,700 |  | 3,700 |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  |  | (0) | $ 13 |
Forecast [Member] |  |  |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | $ 500 |  |  |
California Franchise Tax Board [Member] |  |  |  |  |
Tax Credit Carryforward, Amount | 1,800 |  | 1,800 |  |
New York State Division of Taxation and Finance [Member] |  |  |  |  |
Tax Credit Carryforward, Amount | 1,000 |  | 1,000 |  |
Wisconsin Department of Revenue [Member] |  |  |  |  |
Tax Credit Carryforward, Amount | $ 1,700 |  | $ 1,700 |  |
Valuation Allowance Against State Tax Credits [Member] |  |  |  |  |
Change in valuation allowance | 2.10% |  |  |  |

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