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Note 4 - Short-term Investments - Summary of Short-term Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Investments, amortized cost | $ 30,170 | $ 14,932
Investments, unrealized gains | 57 | 4
Investments, unrealized losses | 0 | (15)
Investments, fair value | 30,227 | 14,921
Corporate Debt Securities [Member] |  |
Investments, amortized cost | 21,814 | 11,310
Investments, unrealized gains | 35 | 0
Investments, unrealized losses | 0 | (15)
Investments, fair value | 21,849 | 11,295
US Treasury and Government Short-Term Debt Securities [Member] |  |
Investments, amortized cost | 8,356 | 3,622
Investments, unrealized gains | 22 | 4
Investments, unrealized losses | 0 | 0
Investments, fair value | $ 8,378 | $ 3,626

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