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Note 5 - Short-term Investments | 12 Months Ended
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Sep. 30, 2025
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | 5. Short-term Investments The Company classifies its short-term investments as available-for-sale debt securities. These 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. The Company had no short-term investments as of September 30, 2025. The Company’s short-term investments as of September 30, 2024 were composed of the following (in thousands):
|  | 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 |
At September 30, 2024, accrued interest receivable related to these short-term investments was $0.3 million, which is included as a component of prepaid expenses and other current assets. The Company has no debt securities in a material unrealized loss position at September 30, 2024 and does not believe the unrealized losses associated with these debt securities represent credit losses based on the evaluation of evidence, which includes an assessment of whether it is more likely than not it will be required to sell or intend to sell the investment before recovery of the investments amortized cost basis. A gain of $9,000 was realized from the sale of short-term investments for the fiscal year ended September 30, 2025. No gains or losses were realized from the sale of short-term investments for the fiscal year ended September 30, 2024.

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