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Note 10 - Common Stock Options - Schedule of Stock Option Transactions (Details) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Options outstanding (in shares) 22,000 34,500  
Options outstanding, weighted average exercise price (in dollars per share) $ 20.23 $ 18.69  
Options outstanding, weighted average remaining contractual term (Year) 5 years 9 months 18 days 5 years 7 months 6 days 5 years 8 months 12 days
Options outstanding, aggregate intrinsic value $ 127,988 $ 18,388 $ 121,278
Options exercised (in shares)   (12,500)  
Options exercised, weighted average exercise price (in dollars per share)   $ 16  
Options granted (in shares) 10,000 0  
Options granted, weighted average exercise price (in dollars per share) $ 16.62    
Options forfeited (in shares) (4,000)    
Options forfeited, weighted average exercise price (in dollars per share) $ 19.9    
Options outstanding (in shares) 28,000 22,000 34,500
Options outstanding, weighted average exercise price (in dollars per share) $ 18.98 $ 20.23 $ 18.69
Vested and exercisable (in shares) 28,000    
Vested and exercisable , weighted average exercise price (in dollars per share) $ 18.98    
Vested and exercisable , weighted average remaining contractual term (Year) 5 years 9 months 18 days    
Vested and exercisable , aggregate intrinsic value $ 127,988    
Weighted-average grant date option fair value (in dollars per share) $ 5.15 $ 0  
Stock-based compensation $ 51,500 $ 21,560  
Intrinsic value of options exercised 0 46,921  
Proceeds from exercise of stock options $ 0 $ 200,000