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Note 9 - Stock Based Compensation - Summary of Stock Option Activity (Details) - $ / shares
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Outstanding (in shares) 41,765 55,656  
Outstanding, weighted average exercise price (in dollars per share) $ 144.43 $ 151.1  
Outstanding, weighted average remaining contractual term (Year) 3 years 1 month 20 days 3 years 7 months 24 days 4 years 6 months 18 days
Granted (in shares) 8,000 7,233  
Granted, weighted average exercise price (in dollars per share) $ 0.86 $ 11.51  
Exercised (in shares) 0 0  
Exercised, weighted average exercise price (in dollars per share) $ 0 $ 0  
Forfeited (in shares) (5,730) (21,124)  
Forfeited, weighted average exercise price (in dollars per share) $ 117.35 $ 88.12  
Outstanding, weighted average exercise price (in dollars per share) $ 123.58 $ 144.43 $ 151.1
Outstanding (in shares) 44,035 41,765 55,656
Outstanding, weighted average exercise price (in dollars per share) $ 123.58 $ 144.43 $ 151.1
Outstanding, weighted average remaining contractual term (Year) 3 years 1 month 20 days 3 years 7 months 24 days 4 years 6 months 18 days
Exercisable (in shares) 44,035    
Exercisable, weighted average exercise price (in dollars per share) $ 123.58    
Exercisable (Year) 3 years 1 month 20 days