General form of registration statement for all companies including face-amount certificate companies

Note 6 - Registered Direct Offerings (Details Textual)

v3.22.2.2
Note 6 - Registered Direct Offerings (Details Textual)
 12 Months Ended
May 12, 2019
$ / shares
shares
Jul. 02, 2018
$ / shares
shares
Feb. 24, 2017
$ / shares
shares
Sep. 30, 2021
shares
Sep. 30, 2016
USD ($)
Shelf Registration Statement, Maximum Amount Authorized | $         $ 50,000,000
Class Of Series F Warrant [Member]          
Class of Warrant or Right, Exercised (in shares)       0  
Class Of Warrant Or Right Acquired Upon Exercise (in shares)       5,591,664  
Class Of Series G Warrant [Member]          
Class Of Warrant Or Right Acquired Upon Exercise (in shares)       6,802,500  
Class Of Series H Warrant [Member]          
Class Of Warrant Or Right Acquired Upon Exercise (in shares)       8,615,384  
Registered Direct Offering 2017 [Member]          
Stock Issued During Period, Shares, New Issues (in shares)     10,166,664    
Shares Issued, Price Per Share (in dollars per share) | $ / shares     $ 0.60    
Registered Direct Offering 2017 [Member] | Class Of Series F Warrant [Member]          
Percentage of Warrants Per Unit     55    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 0.75    
Registered Direct Offering 2018 [Member]          
Stock Issued During Period, Shares, New Issues (in shares)   9,070,000      
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 0.50      
Number Of Accredited Investors   8      
Registered Direct Offering 2018 [Member] | Class Of Series G Warrant [Member]          
Percentage of Warrants Per Unit   75      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares   $ 0.70      
Registered Direct Offering 2019 [Member]          
Stock Issued During Period, Shares, New Issues (in shares) 8,615,384        
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 0.325        
Number Of Accredited Investors 5        
Registered Direct Offering 2019 [Member] | Class Of Series H Warrant [Member]          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 0.40