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Note 12 - Income Taxes (Tables) | 9 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Nine Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Effective tax rate |  |  | 23.1 | % |  |  | 23.1 | % |  |  | 23.4 | % |  |  | 23.5 | %
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
Balance at September 30, 2024 |  | $ | 273,936 |
Increase resulting from prior period tax positions |  |  | — |
Balance at June 30, 2025 |  | $ | 273,936 |

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