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Note 9 - Stockholders' Equity (Tables) | 6 Months Ended
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Mar. 31, 2025
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 |  |  | 25,725 |  |  |  | 3,276 |  |  |  | (8,288 | ) |  |  | (61 | ) |  |  | 20,652 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 46 |  |  |  | 46 |
Balance at March 31, 2024 |  | $ | (62,723 | ) |  | $ | (1,859 | ) |  | $ | 23,199 |  |  | $ | (345 | ) |  | $ | (41,728 | )
​ |  | ​ |  |  | 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 |  |  | (23,860 | ) |  |  | 363 |  |  |  | (5,088 | ) |  |  | (136 | ) |  |  | (28,721 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 36 |  |  |  | 36 |
Balance at March 31, 2025 |  | $ | (58,030 | ) |  | $ | 100 |  |  | $ | 16,380 |  |  | $ | (599 | ) |  | $ | (42,149 | )

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