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Note 5 - Derivative Instruments (Tables) | 6 Months Ended
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Mar. 31, 2025
Notes Tables |
Derivative Instruments, Gain (Loss) [Table Text Block] |
​ |  | Three Months Ended |  |  | Six Months Ended |
​ |  | March 31, |  |  | March 31, |
​ |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Realized losses on derivatives not designated as hedging instruments |  | $ | (1,407 | ) |  | $ | (548 | ) |  | $ | (212 | ) |  | $ | (1,787 | )
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
​ | ​ |  | March 31, |  |  | September 30, |
​ | Hedge Designation |  | 2025 |  |  | 2024 |
​ | ​ |  | ​ |  |  | ​ |
Cross-currency swap | Net Investment Hedge |  | $ | 260,025 |  |  | $ | 75,978 |
Foreign exchange contracts | Undesignated |  |  | 58,920 |  |  |  | 60,101 |

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