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Note 3 - Short-term Investments - Summary of Short-term Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Investments, amortized cost	$ 11,531	$ 30,170
Investments, unrealized gains	2	57
Investments, unrealized losses	(2)	0
Investments, fair value	11,531	30,227
Corporate Debt Securities [Member]
Investments, amortized cost	9,281	21,814
Investments, unrealized gains	0	35
Investments, unrealized losses	(2)	0
Investments, fair value	9,279	21,849
US Treasury and Government Short-Term Debt Securities [Member]
Investments, amortized cost	2,250	8,356
Investments, unrealized gains	2	22
Investments, unrealized losses	0	0
Investments, fair value	$ 2,252	$ 8,378

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