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Note 8 - Income Taxes - Cash Paid for Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Federal | $ 25,197 |  |
Income taxes paid, net of amounts refunded | 30,262 | $ 12,657 | $ 15,105
Illinois Tax Authority [Member] |  |  |
State and local | 1,600 |  |
Other State Tax Authorities [Member] |  |  |
State and local | $ 3,465 |  |

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