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Note 10 - Common Stock Options - Schedule of Stock Option Transactions (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Options outstanding (in shares) 34,500 45,250  
Options outstanding, weighted average exercise price (in dollars per share) $ 18.69 $ 19.34  
Options outstanding, weighted average remaining contractual term (Year) 5 years 7 months 6 days 5 years 8 months 12 days 6 years
Options outstanding, aggregate intrinsic value $ 18,388 $ 121,278 $ 213,898
Options granted (in shares) 0 6,000  
Options granted, weighted average exercise price (in dollars per share)   $ 19.9  
Options exercised (in shares) (12,500) (8,750)  
Options exercised, weighted average exercise price (in dollars per share) $ 16 $ 14.49  
Options forfeited (in shares)   (8,000)  
Options forfeited, weighted average exercise price (in dollars per share)   $ 27.87  
Options outstanding (in shares) 22,000 34,500 45,250
Options outstanding, weighted average exercise price (in dollars per share) $ 20.23 $ 18.69 $ 19.34
Vested and exercisable (in shares) 22,000    
Vested and exercisable , weighted average exercise price (in dollars per share) $ 20.23    
Vested and exercisable , weighted average remaining contractual term (Year) 5 years 7 months 6 days    
Vested and exercisable , aggregate intrinsic value $ 18,388    
Weighted-average grant date option fair value (in dollars per share) $ 0 $ 5.39  
Stock option expense $ 21,560 $ 16,330  
Intrinsic value of options exercised 46,921 58,944  
Proceeds from exercise of stock options $ 200,000 $ 126,814