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Note 3 - Investments | 12 Months Ended
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Sep. 30, 2023
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | 3. Investments Short-term Investments The Company classifies its short-term investments as available-for-sale securities. Available-for-sale securities are carried at fair market value with net unrealized gains and losses reported as a component of accumulated other comprehensive loss in stockholders’ equity. No gains or losses were realized from the sale of short-term investments for the fiscal year ended September 30, 2023. The Company realized losses of $22,000 from the sale of short-term investments for the fiscal year ended September 30, 2022. The Company’s short-term investments were composed of the following (in thousands):
|  | 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 |
|  | AS OF SEPTEMBER 30, 2022 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 909 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 894 |
Total |  | $ | 909 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 894 |
The Company’s short-term investments have contractual maturities ranging from January 2024 to September 2024.

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