Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Registered Direct Offerings (Details Textual)

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Note 7 - Registered Direct Offerings (Details Textual)
 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 10, 2023
$ / shares
shares
May 12, 2019
$ / shares
shares
Jun. 28, 2018
$ / shares
shares
Feb. 20, 2017
$ / shares
shares
Jun. 30, 2023
$ / shares
shares
Jun. 30, 2023
$ / shares
shares
Sep. 30, 2022
$ / shares
shares
Mar. 31, 2023
$ / shares
Sep. 30, 2016
USD ($)
Shelf Registration Statement, Maximum Amount Authorized | $                 $ 50,000,000
Stock Issued During Period, Shares, New Issues         215,625        
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.001       $ 0.001 $ 0.001 $ 0.001 $ 0.001  
Stock Issued During Period, Shares, Warrants Exercised           0      
Class Of Series F Warrant [Member]                  
Percentage of Warrants Per Unit       0.55          
Series F Warrant [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 150.00          
Class of Warrant or Right, Expired During Period (in shares)             27,958    
Class Of Series G Warrant [Member]                  
Percentage of Warrants Per Unit     0.75            
Class Of Series H Warrant [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 80.00              
Series G Warrant [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 140.00                
Class of Warrant or Right, Exercised 34,013                
Stock Issued During Period, Shares, Warrants Exercised 3,402                
Series H Warrant [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 80.00                
Class of Warrant or Right, Exercised 43,077                
Stock Issued During Period, Shares, Warrants Exercised 8,617                
The 2017 SPA [Member]                  
Stock Issued During Period, Shares, New Issues       50,833          
Shares Issued, Price Per Share | $ / shares       $ 120.00          
The 2018 SPA [Member]                  
Stock Issued During Period, Shares, New Issues     45,350            
Shares Issued, Price Per Share | $ / shares     $ 100.00            
Number Of Accredited Investors     8            
Registered Direct Offering 2018 [Member] | Class Of Series G Warrant [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 140.00            
The 2019 SPA [Member]                  
Stock Issued During Period, Shares, New Issues   43,077              
Shares Issued, Price Per Share | $ / shares   $ 65.00              
Number Of Accredited Investors   5