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Note 7 - Convertible Notes Payable - Affiliates (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2020
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Convertible Notes Payable, Noncurrent   $ 4,559,520   $ 4,559,520   $ 3,801,168    
Interest Expense, Total   $ 103,084 $ 100,282 $ 363,424 $ 290,082      
Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]                
Financing Receivable, Interest Rate, Stated Percentage   4.00%   4.00%       4.00%
Warrants Payable With Secured Promissory Notes [Member]                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 0.60    
Class of Warrant or Right, Purchase Price of Warrants or Rights, Per Share (in dollars per share)           $ 0.10    
Chief Executive Officer [Member]                
Deferred Compensation, Transfer to Convertible Notes       $ 436,508        
Chief Executive Officer [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]                
Interest Receivable   $ 19,956   $ 19,956        
Chief Executive Officer [Member] | Warrants Payable With Secured Promissory Notes [Member]                
Class of Warrant or Right, Number Agreed to Sell (in shares)           3,000,000    
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        
Deferred Compensation, Transfer to Convertible Notes       $ 199,573        
President [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]                
Interest Receivable   $ 1,996   1,996        
President [Member] | Warrants Payable With Secured Promissory Notes [Member]                
Class of Warrant or Right, Number Agreed to Sell (in shares)           300,000    
The 2020 Convertible Obligations [Member] | Chief Executive Officer [Member] | Warrants Payable With Secured Promissory Notes [Member]                
Secured Promissory Notes Payable with Warrants           $ 300,000    
The 2020 Convertible Obligations [Member] | President [Member] | Warrants Payable With Secured Promissory Notes [Member]                
Secured Promissory Notes Payable with Warrants           30,000    
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              
Debt Instrument, Convertible, Beneficial Conversion Feature $ 0              
Interest Expense, Total   30,944 25,677 102,814 78,172      
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Chief Executive Officer [Member]                
Convertible Notes Payable, Noncurrent   2,384,820 1,713,318 2,384,820 1,713,318      
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | President [Member]                
Convertible Notes Payable, Noncurrent   1,120,932 889,703 1,120,932 889,703      
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Executive Vice Chairman [Member]                
Convertible Notes Payable, Noncurrent   458,424 442,547 458,424 442,547      
September 2015 Convertible Notes [Member] | Chief Executive Officer [Member]                
Convertible Notes Payable, Total   164,230 158,544 164,230 158,544      
Convertible Debt, Amount Sold to a Shareholder By an Officer           $ 300,000    
September 2015 Convertible Notes [Member] | President [Member]                
Convertible Notes Payable, Total   19,371 18,716 19,371 18,716      
September 2015 Convertible Notes [Member] | Shareholder [Member]                
Convertible Notes Payable, Total   411,743 396,271 411,743 396,271      
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 $ 5,293 $ 16,097 $ 15,712      
Replacement Note Held as Collateral [Member] | Chief Executive Officer [Member]                
Convertible Notes Payable, Total             $ 130,000