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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
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Jun. 30, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.75   $ 0.75          
Convertible Notes Payable, Noncurrent   $ 4,747,829   $ 4,747,829   $ 4,595,841      
Interest Expense, Total   $ 137,911 $ 103,084 $ 545,422 $ 363,424        
Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]                  
Financing Receivable, Interest Rate, Stated Percentage               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          
Minimum [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   0.60   0.60          
Maximum [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 1.50   $ 1.50          
The 2020 Convertible Obligations [Member] | Convertible Debt [Member]                  
Debt Instrument, Interest Rate, Stated Percentage 4.00%                
Debt Instrument, Interest Rate, Stated Percentage, Quarterly 4.00%                
Number of Shares Per Unit (in shares) 1                
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   $ 39,463 30,944 $ 135,892 102,814        
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Chief Executive Officer [Member]                  
Convertible Notes Payable, Noncurrent   2,479,268 2,384,820 2,479,268 2,384,820        
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | President [Member]                  
Convertible Notes Payable, Noncurrent   1,175,174 1,120,932 1,175,174 1,120,932        
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Executive Vice Chairman [Member]                  
Convertible Notes Payable, Noncurrent   476,580 458,424 476,580 458,424        
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Minimum [Member]                  
Number of Warrants Per Unit (in shares) 0.5                
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Maximum [Member]                  
Number of Warrants Per Unit (in shares) 1                
September 2015 Convertible Notes [Member] | Chief Executive Officer [Member]                  
Convertible Notes Payable, Total   169,921 164,230 169,921 164,230        
Convertible Debt, Amount Sold to a Shareholder By an Officer             $ 300,000    
September 2015 Convertible Notes [Member] | Executive Vice Chairman [Member]                  
Convertible Notes Payable, Total   426,860 411,743 426,860 411,743        
September 2015 Convertible Notes [Member] | Consultants [Member]                  
Convertible Notes Payable, Total   20,026 19,371 20,026 19,371        
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 $ 16,097 $ 16,097        
Replacement Note Held as Collateral [Member] | Chief Executive Officer [Member]                  
Convertible Notes Payable, Total                 $ 130,000