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Note 15 - Income Taxes - Reconciliation of Actual Income Tax Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Expense (benefit) for U.S. federal income tax at statutory rate | $ 2,639 | $ (4,763)
Expense (benefit) for U.S. federal income tax at statutory rate, percentage | 21.00% | 21.00%
Research and experimentation tax credit | $ (480) | $ 6
Research and experimentation tax credit, percentage | (3.90%) | (0.10%)
State income taxes, net of federal income tax benefit | $ 302 | $ (265)
State income taxes, net of federal income tax benefit, percentage | 2.50% | 1.20%
Nondeductible goodwill | $ 0 | $ 911
Nondeductible goodwill, percentage | 0.00% | (4.00%)
Change in valuation allowance | $ (2,459) | $ 3,768
Change in valuation allowance, percentage | (19.60%) | (16.60%)
Change in fair value of contingent consideration | $ 0 | $ (278)
Change in fair value of contingent consideration, percentage | 0.00% | 1.20%
Disallowed stock compensation | $ 171 | $ 217
Disallowed stock compensation, percentage | 1.40% | (1.00%)
Impact due to foreign currency translation | $ 51 | $ 460
Impact due to foreign currency translation, percentage | 0.40% | (2.00%)
Other items | $ 139 | $ 117
Other items, percentage | 1.10% | (0.50%)
Income Tax Expense (Benefit) | $ 363 | $ 173
Total tax expense and effective tax rate, percentage | 2.90% | (0.80%)

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