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Note 13 - Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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- Definition 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. + References No definition available. + Details
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