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Note 9 - Stockholders' Equity (Tables) | 9 Months Ended
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Jun. 30, 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 |  |  | 21,725 |  |  |  | 3,799 |  |  |  | (7,971 | ) |  |  | (88 | ) |  |  | 17,465 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 66 |  |  |  | 66 |
Balance at June 30, 2024 |  | $ | (66,723 | ) |  | $ | (1,336 | ) |  | $ | 23,516 |  |  | $ | (352 | ) |  | $ | (44,895 | )
​ |  | ​ |  |  | 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 |  |  | 33,462 |  |  |  | 262 |  |  |  | (39,744 | ) |  |  | (205 | ) |  |  | (6,225 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 54 |  |  |  | 54 |
Balance at June 30, 2025 |  | $ | (708 | ) |  | $ | (1 | ) |  | $ | (18,276 | ) |  | $ | (650 | ) |  | $ | (19,635 | )

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