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Note 3 - Short-term Investments | 6 Months Ended
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Mar. 31, 2023
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | 3. 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 during the three and six months ended March 31, 2023 from the sale of short-term investments. For the three and six months ended March 31, 2022, the Company realized losses of $11,000 and $18,000 from the sale of short-term investments. The Company’s short-term investments were composed of the following (in thousands):
|  | September 30, 2022 (in thousands) |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 909 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 894 |
The Company had no short-term investments at March 31, 2023.

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