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Note 13 - Subsequent Events (Details Textual)
 1 Months Ended 12 Months Ended
Oct. 04, 2024
USD ($)
shares
Oct. 31, 2024
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
Sep. 30, 2023
$ / shares
Sep. 30, 2022
$ / shares
Aug. 31, 2022
USD ($)
Equity Offering, Maximum Amount | $           $ 150,000,000
Stock Issued During Period, Value, New Issues | $     $ 729,387      
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 21.74 $ 19.51 $ 28  
Series A-1 Convertible Preferred Stock [Member]            
Preferred Stock, Par or Stated Value Per Share | $ / shares   $ 10,000        
Subsequent Event [Member] | Series A-1 Convertible Preferred Stock [Member]            
Preferred Stock, Par or Stated Value Per Share | $ / shares   $ 10,000        
At The Market Offering Agreement [Member] | Subsequent Event [Member]            
Equity Offering, Maximum Amount | $ $ 3,870,000 $ 3,870,000        
Stock Issued During Period, Shares, New Issues | shares 220,269          
Stock Issued During Period, Value, New Issues | $ $ 600,000          
Private Placement, Securities Purchase Agreement [Member] | Warrants to Purchase Common Shares [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares   326,560        
Private Placement, Securities Purchase Agreement [Member] | Subsequent Event [Member]            
Preferred Stock, Convertible, Conversion Ratio   0.75        
Shares Issued, Price Per Share | $ / shares   $ 10,272.13        
Proceeds from Issuance or Sale of Equity | $   $ 1,540,819        
Private Placement, Securities Purchase Agreement [Member] | Subsequent Event [Member] | Warrants to Purchase Common Shares [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 3.445        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares   326,560        
Warrants and Rights Outstanding, Term (Year)   5 years        
Private Placement, Securities Purchase Agreement [Member] | Subsequent Event [Member] | Series A-1 Convertible Preferred Stock [Member]            
Stock Issued During Period, Shares, New Issues | shares   150        
Stock Issued During Period, Value, New Issues | $   $ 5,000,000        
Private Placement, Securities Purchase Agreement [Member] | Subsequent Event [Member] | Series A-1 Convertible Preferred Stock [Member] | Conversion of Series A-1 Convertible Preferred Shares to Common Shares [Member]            
Preferred Stock, Convertible, Shares Issuable | shares   2,903        
Preferred Stock, Convertible, Conversion Price | $ / shares   $ 3.445        
Convertible Preferred Stock, Shares Issued upon Conversion | shares   435,414