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Note 3 - Short-term Investments (Tables) | 3 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | As of December 31, 2024 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 16,899 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 16,906 |
U.S. treasury securities and securities of U.S. government-sponsored agency |  |  | 3,742 |  |  |  | 7 |  |  |  | — |  |  |  | 3,749 |
Total |  | $ | 20,641 |  |  | $ | 14 |  |  | $ | — |  |  | $ | 20,655 |
|  | As of September 30, 2024 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 21,814 |  |  | $ | 35 |  |  | $ | — |  |  | $ | 21,849 |
U.S. treasury securities and securities of U.S. government-sponsored agency |  |  | 8,356 |  |  |  | 22 |  |  |  | — |  |  |  | 8,378 |
Total |  | $ | 30,170 |  |  | $ | 57 |  |  | $ | — |  |  | $ | 30,227 |

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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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