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Note 4 - Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2024
Notes Tables |
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] |
|  | Fair Value Measurements as of September 30, 2024 |
(In thousands) |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 10,378 |  |  | $ | 10,378 |  |  | $ | - |  |  | $ | - |
Total cash equivalents |  | $ | 10,378 |  |  | $ | 10,378 |  |  | $ | - |  |  | $ | - |
Investment securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 138,592 |  |  | $ | - |  |  | $ | 138,592 |  |  | $ | - |
Certificates of deposit |  |  | 738 |  |  |  | - |  |  |  | 738 |  |  |  | - |
Total investment securities |  | $ | 139,330 |  |  | $ | - |  |  | $ | 139,330 |  |  | $ | - |
|  | Fair Value Measurements as of September 30, 2023 |
(In thousands) |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 26,467 |  |  | $ | 26,467 |  |  | $ | - |  |  | $ | - |
Total cash equivalents |  | $ | 26,467 |  |  | $ | 26,467 |  |  | $ | - |  |  | $ | - |
Investment securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 8,115 |  |  | $ | - |  |  | $ | 8,115 |  |  | $ | - |
U.S. Treasury securities |  |  | 128,514 |  |  |  | - |  |  |  | 128,514 |  |  |  | - |
Total investment securities |  | $ | 136,629 |  |  | $ | - |  |  | $ | 136,629 |  |  | $ | - |

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