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Note 3 - Short-term Investments - Summary of Short-term Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Investments, amortized cost | $ 20,641 | $ 30,170
Investments, unrealized gains | 14 | 57
Investments, unrealized losses | 0 | 0
Investments, fair value | 20,655 | 30,227
Corporate Debt Securities [Member] |  |
Investments, amortized cost | 16,899 | 21,814
Investments, unrealized gains | 7 | 35
Investments, unrealized losses | 0 | 0
Investments, fair value | 16,906 | 21,849
US Treasury and Government Short-Term Debt Securities [Member] |  |
Investments, amortized cost | 3,742 | 8,356
Investments, unrealized gains | 7 | 22
Investments, unrealized losses | 0 | 0
Investments, fair value | $ 3,749 | $ 8,378

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