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Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Research and development credit	$ 4,929	$ 4,712
Capitalized Research And Experimental	1,916	$ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Deferred Tax Assets, Net	0
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	32,390
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	1,526
Research and development credit	2,844
State and Local Jurisdiction [Member]
Research and development credit	$ 306

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Costs that are paid or incurred in connection with the trade or business which represents cost in the experimental or laboratory sense.

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-Topic 740
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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