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Note 4 - Fair Value of Financial Instruments - Fair Value by Hierarchy (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Total assets | $ 30,189 | $ 14,921
Fair Value, Inputs, Level 1 [Member] |  |
Total assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Total assets | 30,189 | 14,921
Fair Value, Inputs, Level 3 [Member] |  |
Total assets | 0 | 0
Corporate Debt Securities [Member] |  |
Short term investment | 21,634 | 11,295
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Short term investment | 0 | 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Short term investment | 21,634 | 11,295
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Short term investment | 0 | 0
US Treasury and Government Short-Term Debt Securities [Member] |  |
Short term investment | 8,555 | 3,626
US Treasury and Government Short-Term Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Short term investment |  | 0
US Treasury and Government Short-Term Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Short term investment | $ 8,555 | 3,626
US Treasury and Government Short-Term Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Short term investment |  | $ 0

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