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Note 16 - Income Taxes - Reconciliation of Actual Income Tax Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Expense (benefit) for U.S. federal income tax at statutory rate | $ (1,357) | $ 2,639
Expense (benefit) for U.S. federal income tax at statutory rate, percentage | 21.00% | 21.00%
Research and experimentation tax credit | $ (572) | $ (480)
Research and experimentation tax credit | 8.80% | (3.90%)
State income taxes, net of federal income tax benefit | $ 32 | $ 302
State income taxes, net of federal income tax benefit, percentage | (0.50%) | 2.50%
Change in valuation allowance | $ 1,934 | $ (2,459)
Change in valuation allowance, percentage | (29.90%) | (19.60%)
Foreign earnings tax | $ 125 | $ 0
Foreign earnings tax, percentage | (1.90%) | 0.00%
Stock compensation | $ (210) | $ 171
Stock compensation, percentage | 3.20% | 1.40%
Impact due to foreign currency translation | $ (44) | $ 51
Impact due to foreign currency translation | 0.70% | 0.40%
Other items | $ 206 | $ 139
Other items, percentage | (3.20%) | 1.10%
Income Tax Expense (Benefit) | $ 114 | $ 363
Total tax expense and effective tax rate, percentage | (1.80%) | 2.90%

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