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Note 3 - Short-term Investments | 3 Months Ended
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Dec. 31, 2024
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 income (loss) in stockholders’ equity. The Company’s short-term investments were composed of the following (in thousands):
|  | 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 |
The Company had no securities in a material unrealized loss position at December 31, 2024 and September 30, 2024 and does not believe the unrealized losses associated with these 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 $10,000 was realized during the three months ended December 31, 2024 from the sale of short-term investments. No gains or losses were recognized during the three months ended December 31, 2023 from the sale of short-term investments.

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