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Note 13 - Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Income taxes computed at the federal statutory rate	$ (2,309)	$ (3,314)
Change in valuation allowance	10,376	1,065
Nondeductible compensation, interest expense and other	232	4,101
State income taxes, net of federal tax benefit	(605)	(859)
Change in R&D credit carryover	(433)	(186)
Stock options and other prior year true-ups	111	25
Foreign rate differential	28	(1)
State business credit utilization	0	(90)
Provision (benefit) for income taxes	$ 7,400	$ 741

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The amount of change in research and development carryover during the period.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state business credit utilization.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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