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Note 6 - Convertible Notes Payable - Affiliates (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Convertible Notes Payable, Noncurrent   $ 4,632,167   $ 4,632,167   $ 4,595,841    
Interest Expense, Total       $ 104,340 $ 117,602      
Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]                
Financing Receivable, Interest Rate, Stated Percentage   4.00%   4.00%        
President [Member]                
Number of Shares Per Unit (in shares)   1   1        
Number of Warrants Per Unit (in shares)   1   1        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.75   $ 0.75        
The 2020 Convertible Obligations [Member] | Convertible Debt [Member]                
Debt Instrument, Interest Rate, Stated Percentage 4.00%              
Debt Instrument, Interest Rate, Stated Percentage, Quarterly 1.00%              
Number of Shares Per Unit (in shares) 1              
Number of Warrants Per Unit (in shares) 0.5              
Conversion Price Per Unit (in dollars per share) $ 0.50              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 1         $ 0.75    
Debt Instrument, Convertible, Beneficial Conversion Feature $ 0              
Interest Expense, Total   $ 30,960 $ 42,394          
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Chief Executive Officer [Member]                
Convertible Notes Payable, Noncurrent   2,432,044 1,904,342 $ 2,432,044 1,904,342      
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | President [Member]                
Convertible Notes Payable, Noncurrent   1,126,545 909,870 1,126,545 909,870      
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Executive Vice Chairman [Member]                
Convertible Notes Payable, Noncurrent   467,503 450,103 467,503 450,103      
September 2015 Convertible Notes [Member] | Chief Executive Officer [Member]                
Convertible Notes Payable, Total   167,075 161,385 167,075 161,385      
Convertible Debt, Amount Sold to a Shareholder By an Officer             $ 300,000  
September 2015 Convertible Notes [Member] | President [Member]                
Convertible Notes Payable, Total   19,698 19,043 19,698 19,043      
September 2015 Convertible Notes [Member] | Shareholder [Member]                
Convertible Notes Payable, Total   419,302 404,185 $ 419,302 $ 404,185      
September 2015 Convertible Notes [Member] | Convertible Debt [Member]                
Conversion Price Per Unit (in dollars per share)             $ 0.60  
Debt Instrument, Convertible, Beneficial Conversion Feature           $ 0    
Interest Expense, Total   $ 5,366 $ 5,366          
Replacement Note Held as Collateral [Member] | Chief Executive Officer [Member]                
Convertible Notes Payable, Total               $ 130,000