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Note 9 - Income Taxes - Income Tax Expense (Details) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Current income taxes:    
Federal $ 3,128,721 $ 2,935,052
State 689,671 650,238
Total current income taxes 3,818,392 3,585,290
Deferred income taxes:    
Federal (398,588) (223,862)
State 276,807 262,103
Total deferred income taxes (121,781) 38,241
Federal 0 (129,600)
State 0 (2,020)
Total amortization of R&D tax credits 0 (131,620)
Total income tax expense $ 3,696,611 $ 3,491,911