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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Deferred Income Tax Liabilities, Net | $ 49,660 | $ 32,282
Tax Credit Carryforward, Valuation Allowance | 2,300 |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 494 | $ (0)
Forecast [Member] |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 500 |
New York State Division of Taxation and Finance [Member] |  |
Tax Credit Carryforward, Amount | 700 |
Wisconsin Department of Revenue [Member] |  |
Tax Credit Carryforward, Amount | $ 1,600 |

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