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Note 10 - Cash Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 31, 2025 | Mar. 31, 2025 | Mar. 31, 2024
Payments of Dividends, Total |  | $ 6.0 | $ 5.7
Dividends Payable |  | $ 0.1 | $ 0.1
O 2026 Q1 Dividends [Member] | Subsequent Event [Member] |  |  |
Dividends Payable, Date Declared | Aug. 20, 2025 |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.05 |  |
Dividends Payable, Date to be Paid | Sep. 10, 2025 |  |
Dividends Payable, Date of Record | Sep. 02, 2025 |  |

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