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Note 5 - Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 21.00%
Deferred Tax Liabilities, Net | $ 122.2 | $ 122.2 |
Deferred Tax Liabilities, Increase (Decrease) From OBBA | $ 31.0 |  |

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