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Note 6 - Convertible Notes Payable - Affiliates (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2016
Interest Expense, Total $ 100,282 $ 84,714 $ 290,082 $ 276,815      
January 2015 Convertible Notes [Member]              
Financing Receivable, Interest Rate, Stated Percentage 4.00%   4.00%        
Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]              
Financing Receivable, Interest Rate, Stated Percentage 4.00%   4.00%        
Warrants Payable With Secured Promissory Notes [Member]              
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.60   $ 0.60        
Class of Warrant or Right, Purchase Price of Warrants or Rights, Per Share $ 0.10   $ 0.10        
Chief Executive Officer [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]              
Financing Receivable, Interest Rate, Stated Percentage 4.00%   4.00%        
Interest Receivable $ 7,956   $ 7,956        
Chief Executive Officer [Member] | Warrants Payable With Secured Promissory Notes [Member]              
Class of Warrant or Right, Number Agreed to Sell     3,000,000        
President [Member]              
Number of Shares Per Unit 1   1        
Number of Warrants Per Unit 1   1        
President [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]              
Interest Receivable $ 796   $ 796        
President [Member] | Warrants Payable With Secured Promissory Notes [Member]              
Class of Warrant or Right, Number Agreed to Sell     300,000        
January 2015 Convertible Notes [Member] | Chief Executive Officer [Member] | Warrants Payable With Secured Promissory Notes [Member]              
Secured Promissory Notes Payable with Warrants 300,000   $ 300,000        
January 2015 Convertible Notes [Member] | President [Member] | Warrants Payable With Secured Promissory Notes [Member]              
Secured Promissory Notes Payable with Warrants $ 30,000   $ 30,000        
January 2015 Convertible Notes [Member] | Convertible Debt [Member]              
Debt Instrument, Interest Rate, Stated Percentage           4.00%  
Number of Shares Per Unit 1   1        
Number of Warrants Per Unit 0.5   0.5        
Conversion Price Per Unit $ 0.50   $ 0.50        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1   $ 1        
Debt Instrument, Convertible, Beneficial Conversion Feature     $ 0        
Interest Expense, Total $ 25,677 25,677 78,172 78,172      
January 2015 Convertible Notes [Member] | Convertible Debt [Member] | Chief Executive Officer [Member]              
Convertible Notes Payable, Noncurrent 1,713,318 1,654,736 1,713,318 1,654,736      
January 2015 Convertible Notes [Member] | Convertible Debt [Member] | President [Member]              
Convertible Notes Payable, Noncurrent 889,703 859,282 889,703 859,282      
January 2015 Convertible Notes [Member] | Convertible Debt [Member] | Executive Vice Chairman [Member]              
Convertible Notes Payable, Noncurrent 442,547 427,416 442,547 427,416      
September 2015 Convertible Notes [Member] | Chief Executive Officer [Member]              
Convertible Notes Payable, Total 158,544   158,544       $ 405,831
September 2015 Convertible Notes [Member] | Executive Vice Chairman [Member]              
Convertible Notes Payable, Total 18,716 447,989 18,716 447,989     82,921
September 2015 Convertible Notes [Member] | Chief Financial Officer [Member]              
Convertible Notes Payable, Total             $ 16,382
September 2015 Convertible Notes [Member] | Shareholder [Member]              
Convertible Notes Payable, Total $ 396,271 91,417 $ 396,271 91,417      
September 2015 Convertible Notes [Member] | CEO, President, and Executive Vice Chairman [Member]              
Convertible Notes Payable, Total   18,061   18,061      
September 2015 Convertible Notes [Member] | Convertible Debt [Member]              
Debt Instrument, Interest Rate, Stated Percentage         4.00%    
Conversion Price Per Unit $ 0.60   $ 0.60        
Debt Instrument, Convertible, Beneficial Conversion Feature     $ 0        
Interest Expense, Total $ 5,293 $ 5,341 15,712 $ 15,743      
Replacement Note Held as Collateral [Member] | Chief Executive Officer [Member]              
Convertible Notes Payable, Total $ 130,000   130,000        
Convertible Debt, Amount Sold to a Shareholder By an Officer     $ 300,000