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Note 12 - Stockholders' Equity - Stock Option and Warrant Activity (Details) - $ / shares
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Granted, Options (in shares) 330,000    
Forfeited, Options (in shares) (13,000)    
Granted, Options (in shares) 330,000    
Outstanding (in shares) 2,107,895    
Outstanding, Options, Weighted Average Exercise Price (in dollars per share) $ 2.25    
Restricted Stock [Member]      
Outstanding (in shares) 200,000 200,000  
Granted (in shares) 0 0  
Exercised (in shares) 0 0  
Forfeited (in shares) 0 0  
Expired (in shares) 0 0  
Granted (in shares) 0 0  
Outstanding (in shares) 200,000 200,000 200,000
Share-Based Payment Arrangement, Option [Member]      
Outstanding, Options (in shares) 1,831,515 1,157,927  
Outstanding, Options, Weighted Average Exercise Price (in dollars per share) $ 2.56 $ 3.49  
Granted, Options (in shares) 330,000 702,000  
Granted, Options, Weighted Average Exercise Price (in dollars per share) $ 0.83 $ 1.19  
Exercised, Options (in shares) 0 0  
Exercised, Options, Weighted Average Exercise Price (in dollars per share) $ 0 $ 0  
Forfeited, Options (in shares) (53,518) (28,348)  
Forfeited, Options, Weighted Average Exercise Price (in dollars per share) $ 1.5 $ 2.49  
Expired, Options (in shares) (102) (64)  
Expired, Options, Weighted Average Exercise Price (in dollars per share) $ 1,413.97 $ 1,873.44  
Granted, Options (in shares) 330,000 702,000  
Outstanding (in shares) 2,107,895 1,831,515 1,157,927
Outstanding, Options, Weighted Average Exercise Price (in dollars per share) $ 2.25 $ 2.56 $ 3.49
Stock Warrants [Member]      
Outstanding (in shares) 804,533 1,757,629 1,757,629
Outstanding, Warrants, Weighted Average Exercise Price (in dollars per share) $ 2.85 $ 3.64 $ 3.64
Granted (in shares)   0 0
Granted, Warrants, Weighted Average Exercise Price (in dollars per share)   $ 0 $ 0
Exercised (in shares)   0 0
Exercised, Warrants, Weighted Average Exercise Price (in dollars per share)   $ 0 $ 0
Forfeited (in shares)   0 0
Forfeited, Warrants, Weighted Average Exercise Price (in dollars per share)   $ 0 $ 0
Expired (in shares)   (953,096) 0
Expired, Warrants, Weighted Average Exercise Price (in dollars per share)   $ 2.85 $ 0
Granted (in shares)   0 0
Granted, Warrants, Weighted Average Exercise Price (in dollars per share)   $ 0 $ 0
Outstanding (in shares)   804,533 1,757,629
Outstanding, Warrants, Weighted Average Exercise Price (in dollars per share)   $ 2.85 $ 3.64