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Note 3 - Investments - Available-for-sale Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 09, 2022
--- | --- | --- | ---
Fair value | $ 139,330 | $ 136,629 |
Short-term US Treasury Securities [Member] |  |  |
Amortized cost | 113,987 | 122,534 |
Unrealized gains | 382 | 0 |
Unrealized losses | (45) | (143) |
Fair value | 114,324 | 122,391 |
Short-term Certificates of Deposit [Member] |  |  |
Amortized cost | 500 | 8,014 |
Unrealized gains | 1 | 0 |
Unrealized losses | 0 | (119) |
Fair value | 501 |  | $ 7,895
Short-term Investment [Member] |  |  |
Amortized cost | 114,487 | 130,548 |
Unrealized gains | 384 | 0 |
Unrealized losses | (45) | (262) |
Fair value | 114,825 |  | 130,286
US Treasury Securities [Member] |  |  |
Amortized cost |  | 6,719 |
Unrealized gains |  | 0 |
Unrealized losses |  | (596) |
Fair value |  |  | 6,123
Long-term Certificates of Deposit [Member] |  |  |
Amortized cost | 248 | 248 |
Unrealized gains | 0 | 0 |
Unrealized losses | (12) | (28) |
Fair value | 236 |  | 220
Long-term Investment [Member] |  |  |
Amortized cost | 24,762 | 6,967 |
Unrealized gains | 0 | 0 |
Unrealized losses | (257) | $ (624) |
Fair value | 24,505 |  | $ 6,343
Long-term US Treasury Securities [Member] |  |  |
Amortized cost | 24,514 |  |
Unrealized gains | 0 |  |
Unrealized losses | (245) |  |
Fair value | $ 24,269 |  |

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