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Note 10 - Common Stock Options - Schedule of Stock Option Transactions (Details) - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Options outstanding (in shares) 28,000 22,000  
Options outstanding, weighted average exercise price (in dollars per share) $ 18.98 $ 20.23  
Options outstanding, weighted average remaining contractual term (Year) 4 years 9 months 18 days 5 years 7 months 6 days 5 years 9 months 18 days
Options outstanding, aggregate intrinsic value $ 125,388 $ 18,388 $ 127,988
Options granted (in shares) 0 10,000  
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 exercised (in shares) 0    
Options exercised, weighted average exercise price (in dollars per share)    
Options outstanding (in shares) 28,000 28,000 22,000
Options outstanding, weighted average exercise price (in dollars per share) $ 18.98 $ 18.98 $ 20.23
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) 4 years 9 months 18 days    
Vested and exercisable , aggregate intrinsic value $ 125,388    
Weighted-average grant date option fair value (in dollars per share) $ 0 $ 5.15  
Stock-based compensation $ 0 $ 51,500  
Intrinsic value of options exercised 0 0  
Proceeds from exercise of stock options $ 0 $ 0