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Note 8 - Income Taxes - Income Tax Expense (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Current income taxes:    
Federal $ 2,935,052 $ 2,494,942
State 650,238 523,571
Total current income taxes 3,585,290 3,018,513
Deferred income taxes:    
Federal (223,862) (11,160,425)
State 262,103 (3,097,869)
Total deferred income taxes 38,241 (14,258,294)
Federal (129,600) (165,652)
State (2,020) (5,212)
Total amortization of R&D tax credits (131,620) (170,864)
Total income tax expense (benefit) $ 3,491,911 $ (11,410,645)