Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Registered Direct Offerings (Details Textual)

v3.23.1
Note 7 - Registered Direct Offerings (Details Textual)
 12 Months Ended
Mar. 10, 2023
$ / shares
shares
Feb. 17, 2021
shares
May 12, 2019
$ / shares
shares
Jun. 28, 2018
$ / shares
shares
Feb. 20, 2017
$ / 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 | shares   215,625            
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.001         $ 0.001 $ 0.001  
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) | 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 | shares 34,013              
Stock Issued During Period, Shares, Warrants Exercised | shares 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 | shares 43,077              
Stock Issued During Period, Shares, Warrants Exercised | shares 8,617              
The 2017 SPA [Member]                
Stock Issued During Period, Shares, New Issues | shares         50,833      
Shares Issued, Price Per Share | $ / shares         $ 120.00      
The 2018 SPA [Member]                
Stock Issued During Period, Shares, New Issues | shares       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 | shares     43,077          
Shares Issued, Price Per Share | $ / shares     $ 65.00          
Number Of Accredited Investors     5