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Note 4 - Investments - Available-for-sale Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 09, 2022
--- | --- | --- | ---
Fair value | $ 137,282 | $ 28,549 |
Short-term Certificates of Deposit [Member] |  |  |
Amortixed cost | 9,750 | 5,945 |
Unrealized gains | 0 | 0 |
Unrealized losses | 204 | 143 |
Fair value | 9,546 |  | $ 5,802
Short-term US Treasury Securities [Member] |  |  |
Amortixed cost | 121,458 |  |
Unrealized gains | 0 |  |
Unrealized losses | 278 |  |
Fair value | 121,180 |  |
Short-term Investment [Member] |  |  |
Amortixed cost | 131,208 | 5,945 |
Unrealized gains | 0 | 0 |
Unrealized losses | 482 | 143 |
Fair value | 130,726 |  | 5,802
US Treasury Securities [Member] |  |  |
Amortixed cost |  | 16,178 |
Unrealized gains |  | 0 |
Unrealized losses |  | 1,085 |
Fair value |  |  | 15,093
Long-term Certificates of Deposit [Member] |  |  |
Amortixed cost | 495 | 8,016 |
Unrealized gains | 0 | 0 |
Unrealized losses | 40 | 362 |
Fair value | 455 |  | 7,654
Long-term Investment [Member] |  |  |
Amortixed cost | 7,206 | 24,194 |
Unrealized gains | 0 | 0 |
Unrealized losses | 650 | $ 1,447 |
Fair value | 6,556 |  | $ 22,747
Long-term US Treasury Securities [Member] |  |  |
Amortixed cost | 6,711 |  |
Unrealized gains | 0 |  |
Unrealized losses | 610 |  |
Fair value | $ 6,101 |  |

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