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Note 6 - Other Comprehensive Income (Loss) - Changes in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Balance | $ 267,435 | $ 275,763 | $ 300,095 | $ 275,763 | $ 315,163
Unrealized gain (loss) on available-for-sale securities, before tax | 64 |  | (57) | (94) | 333
Unrealized gain (loss) on available-for-sale securities, tax | (13) |  | 12 | 20 | (88)
Unrealized gain (loss) on available-for-sale investments | 51 |  | (45) | (74) | 245
Other comprehensive income (loss) | 603 |  | (346) | (493) | 674
Unrealized gain (loss) on foreign currency translation, before tax | 656 |  | (377) | (504) | 538
Unrealized gain (loss) on foreign currency translation, tax | (104) |  | 76 | 85 | (109)
Unrealized gain (loss) on foreign currency translation, net of tax | 552 |  | (301) | (419) | 429
Other comprehensive income (loss), before tax | 720 |  | (434) | (598) | 871
Other comprehensive income (loss), tax | (117) |  | 88 | 105 | (197)
Total other comprehensive income (loss) | 603 |  | (346) | (493) | 674
Balance | 265,899 | 267,435 | 279,208 | 265,899 | 279,208
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |  |  |  |
Balance | (59) | 66 |  | 66 |
Other comprehensive income (loss) | 51 | (125) |  |  |
Total other comprehensive income (loss) | 51 | (125) |  |  |
Balance | (8) | (59) |  | (8) |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |
Balance | 42 | 1,013 |  | 1,013 |
Other comprehensive income (loss) | 552 | (971) |  |  |
Total other comprehensive income (loss) | 552 | (971) |  |  |
Balance | 594 | 42 |  | 594 |
AOCI Attributable to Parent [Member] |  |  |  |  |
Balance | (17) | 1,079 | 476 | 1,079 | (544)
Other comprehensive income (loss) | 603 | (1,096) |  |  |
Total other comprehensive income (loss) | 603 | (1,096) |  |  |
Balance | $ 586 | $ (17) | $ 130 | $ 586 | $ 130

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