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Note 12 - Stockholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  |  |  |  |  | Unrealized |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Gains (Losses) |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | on Available- |  |  | Gains (Losses) |  |  |  |  |  |  |  |  |
|  | Currency |  |  | for-Sale |  |  | on Derivative |  |  | Pension |  |  |  |  |
|  | Translation |  |  | Securities |  |  | Asset or Liability |  |  | Liability |  |  |  |  |
|  | Adjustments |  |  | Net of tax |  |  | Net of tax |  |  | Adjustments |  |  | Total |
Balance at September 30, 2022 |  | $ | (165,694 | ) |  | $ | (10,909 | ) |  | $ | 93,020 |  |  | $ | (333 | ) |  | $ | (83,916 | )
Other comprehensive income (loss) before reclassifications |  |  | 77,246 |  |  |  | 5,774 |  |  |  | (61,533 | ) |  |  | (104 | ) |  |  | 21,383 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 107 |  |  |  | 107 |
Balance at September 30, 2023 |  |  | (88,448 | ) |  |  | (5,135 | ) |  |  | 31,487 |  |  |  | (330 | ) |  |  | (62,426 | )
Other comprehensive income (loss) before reclassifications |  |  | 54,278 |  |  |  | 4,872 |  |  |  | (10,019 | ) |  |  | (245 | ) |  |  | 48,886 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 76 |  |  |  | 76 |
Balance at September 30, 2024 |  |  | (34,170 | ) |  |  | (263 | ) |  |  | 21,468 |  |  |  | (499 | ) |  |  | (13,464 | )
Other comprehensive income (loss) before reclassifications |  |  | 21,252 |  |  |  | 438 |  |  |  | (30,197 | ) |  |  | (313 | ) |  |  | (8,820 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | 38 |  |  |  | — |  |  |  | 33 |  |  |  | 71 |
Balance at September 30, 2025 |  | $ | (12,918 | ) |  | $ | 213 |  |  | $ | (8,729 | ) |  | $ | (779 | ) |  | $ | (22,213 | )

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