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Note 13 - Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Income taxes computed at the federal statutory rate	$ 1,296	$ 715
Change in valuation allowance	(7,134)	(5)
Nondeductible compensation, interest expense and other	24	40
State income taxes, net of federal tax benefit	364	155
Change in R&D credit carryover	95	(66)
Stock options and other prior year true-ups	(7)	(142)
Foreign rate differential	(21)	(8)
Refundable Federal AMT Credit		28
State business credit utilization	(323)	(145)
Provision for income tax (benefit) expense	$ (5,706)	$ 572

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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 refundable federal ATM credit.

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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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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 foreign income tax expense (benefit).

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