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Note 3 - Income Taxes - Reconciliation of the Federal Statutory Income Tax Rate (Details)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Federal statutory rate 21.00% 21.00%
State income taxes 2.20% 2.00%
Change in valuation allowance 0.00% (0.50%)
Expiration and utilization of state NOL’s 0.00% 0.40%
Research and development credits (0.70%) (2.50%)
Excess tax expense (benefits) from stock-based compensation 1.50% 0.10%
Tax rate 21.00% 20.30%