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Note 14 - Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Income taxes computed at the federal statutory rate | $ 239 | $ 1,296
Change in valuation allowance | 435 | (7,134)
Nondeductible compensation, interest expense and other | 57 | 24
State income taxes, net of federal tax benefit | 210 | 364
Change in R&D credit carryover | 19 | (219)
Stock options and other prior year true-ups | (175) | (7)
Foreign rate differential | (117) | (21)
State business credit utilization | (234) | (9)
Provision (benefit) for income taxes | $ 434 | $ (5,706)

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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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