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Note 3 - Short-term Investments (Tables) | 9 Months Ended
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Jun. 30, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | As of June 30, 2024 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 21,655 |  |  | $ | — |  |  | $ | (21 | ) |  | $ | 21,634 |
U.S. treasury securities and securities of U.S. government-sponsored agency |  |  | 8,566 |  |  |  | — |  |  |  | (11 | ) |  |  | 8,555 |
Total |  | $ | 30,221 |  |  | $ | — |  |  | $ | (32 | ) |  | $ | 30,189 |
|  | As of September 30, 2023 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 11,310 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 11,295 |
U.S. treasury securities and securities of U.S. government-sponsored agency |  |  | 3,622 |  |  |  | 4 |  |  |  | — |  |  |  | 3,626 |
Total |  | $ | 14,932 |  |  | $ | 4 |  |  | $ | (15 | ) |  | $ | 14,921 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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