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Note 9 - Stockholders' Equity (Tables) | 3 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
​ |  | ​ |  |  | Unrealized |  |  | ​ |  |  | ​ |  |  | ​ |
​ |  | ​ |  |  | Gains (Losses) |  |  | ​ |  |  | ​ |  |  | ​ |
​ |  | ​ |  |  | on Available- |  |  |  |  |  | Pension |  |  | ​ |
​ |  | Currency |  |  | for-Sale |  |  | ​Gains (Losses) |  |  | Liability |  |  | ​ |
​ |  | Translation |  |  | Securities |  |  | on Derivative |  |  | Adjustments |  |  | ​ |
​ |  | Adjustments |  |  | Net of tax |  |  | Net of tax |  |  | Net of tax |  |  | Total |
Balance at September 30, 2023 |  | $ | (88,448 | ) |  | $ | (5,135 | ) |  | $ | 31,487 |  |  | $ | (330 | ) |  | $ | (62,426 | )
Other comprehensive income (loss) before reclassifications |  |  | 46,494 |  |  |  | 2,524 |  |  |  | (13,368 | ) |  |  | (35 | ) |  |  | 35,615 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 27 |  |  |  | 27 |
Balance at December 31, 2023 |  | $ | (41,954 | ) |  | $ | (2,611 | ) |  | $ | 18,119 |  |  | $ | (338 | ) |  | $ | (26,784 | )
​ |  | ​ |  |  | Unrealized |  |  | ​ |  |  | ​ |  |  | ​ |
​ |  | ​ |  |  | Gains (Losses) |  |  | ​ |  |  | ​ |  |  | ​ |
​ |  | ​ |  |  | on Available- |  |  |  |  |  | Pension |  |  | ​ |
​ |  | Currency |  |  | for-Sale |  |  | ​Gains (Losses) |  |  | Liability |  |  | ​ |
​ |  | Translation |  |  | Securities |  |  | on Derivative |  |  | Adjustments |  |  | ​ |
​ |  | Adjustments |  |  | Net of tax |  |  | Net of tax |  |  | Net of tax |  |  | Total |
Balance at September 30, 2024 |  | $ | (34,170 | ) |  | $ | (263 | ) |  | $ | 21,468 |  |  | $ | (499 | ) |  | $ | (13,464 | )
Other comprehensive income (loss) before reclassifications |  |  | (47,298 | ) |  |  | 163 |  |  |  | 5,412 |  |  |  | (68 | ) |  |  | (41,791 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 18 |  |  |  | 18 |
Balance at December 31, 2024 |  | $ | (81,468 | ) |  | $ | (100 | ) |  | $ | 26,880 |  |  | $ | (549 | ) |  | $ | (55,237 | )

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