Annual report pursuant to Section 13 and 15(d)

Note 6 - Registered Direct Offerings (Details Textual)

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Note 6 - Registered Direct Offerings (Details Textual)
 12 Months Ended
Feb. 17, 2021
shares
May 12, 2019
item
$ / shares
shares
Jun. 28, 2018
item
$ / shares
shares
Feb. 20, 2017
$ / shares
shares
Sep. 30, 2022
shares
Sep. 30, 2016
USD ($)
Shelf Registration Statement, Maximum Amount Authorized | $           $ 50,000,000
Stock Issued During Period, Shares, New Issues 43,125,004          
Class Of Series F Warrant [Member]            
Percentage of Warrants Per Unit       0.55    
Class Of Warrant Or Right Acquired Upon Exercise         6,802,500  
Series F Warrant [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 0.75    
Class of Warrant or Right, Expired During Period (in shares)         5,591,664  
Class Of Series G Warrant [Member]            
Percentage of Warrants Per Unit     0.75      
Class Of Warrant Or Right Acquired Upon Exercise         8,615,384  
Class Of Series H Warrant [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 0.40        
The 2017 SPA [Member]            
Stock Issued During Period, Shares, New Issues       10,166,664    
Shares Issued, Price Per Share | $ / shares       $ 0.60    
The 2018 SPA [Member]            
Stock Issued During Period, Shares, New Issues     9,070,000      
Shares Issued, Price Per Share | $ / shares     $ 0.50      
Number Of Accredited Investors | item     8      
Registered Direct Offering 2018 [Member] | Class Of Series G Warrant [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 0.70      
The 2019 SPA [Member]            
Stock Issued During Period, Shares, New Issues   8,615,384        
Shares Issued, Price Per Share | $ / shares   $ 0.325        
Number Of Accredited Investors | item   5