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Note 6 - Convertible Notes Payable - Affiliates (Details Textual) - USD ($)
9 Months Ended 12 Months Ended
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Convertible Notes Payable, Noncurrent   $ 3,801,168 $ 3,525,216    
Interest Expense, Total   413,057 360,492    
Conversion of Deferred Compensation into Note Payable Affiliate   $ 150,000    
Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]          
Financing Receivable, Interest Rate, Stated Percentage   4.00%      
Warrants Payable With Secured Promissory Notes [Member]          
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.60      
Class of Warrant or Right, Purchase Price of Warrants or Rights, Per Share   $ 0.10      
Chief Executive Officer [Member]          
Number of Shares Per Unit     1    
Number of Warrants Per Unit     1    
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.75    
Chief Executive Officer [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]          
Financing Receivable, Interest Rate, Stated Percentage   4.00%      
Interest Receivable   $ 10,948      
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      
Number of Warrants Per Unit   1      
President [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]          
Interest Receivable   $ 1,095      
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      
January 2015 Convertible Notes [Member] | President [Member] | Warrants Payable With Secured Promissory Notes [Member]          
Secured Promissory Notes Payable with Warrants   $ 30,000      
January 2015 Convertible Notes [Member] | Convertible Debt [Member]          
Debt Instrument, Interest Rate, Stated Percentage         4.00%
Number of Shares Per Unit   1      
Number of Warrants Per Unit   0.5      
Conversion Price Per Unit   $ 0.50      
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 1      
Debt Instrument, Convertible, Beneficial Conversion Feature   $ 0      
Interest Expense, Total   104,134 $ 104,135    
January 2015 Convertible Notes [Member] | Convertible Debt [Member] | Chief Executive Officer [Member]          
Convertible Notes Payable, Noncurrent   1,727,923 1,669,342    
January 2015 Convertible Notes [Member] | Convertible Debt [Member] | President [Member]          
Convertible Notes Payable, Noncurrent   897,287 866,866    
January 2015 Convertible Notes [Member] | Convertible Debt [Member] | Executive Vice Chairman [Member]          
Convertible Notes Payable, Noncurrent   446,320 431,188    
September 2015 Convertible Notes [Member] | Chief Executive Officer [Member]          
Convertible Notes Payable, Total   159,963 452,400    
September 2015 Convertible Notes [Member] | Executive Vice Chairman [Member]          
Convertible Notes Payable, Total   18,879 18,224    
September 2015 Convertible Notes [Member] | Shareholder [Member]          
Convertible Notes Payable, Total   $ 400,405 87,196    
September 2015 Convertible Notes [Member] | Convertible Debt [Member]          
Debt Instrument, Interest Rate, Stated Percentage       4.00%  
Conversion Price Per Unit   $ 0.60      
Debt Instrument, Convertible, Beneficial Conversion Feature   $ 0      
Interest Expense, Total   21,428 $ 21,094    
Replacement Note Held as Collateral [Member] | Chief Executive Officer [Member]          
Convertible Notes Payable, Total   130,000      
Convertible Debt, Amount Sold to a Shareholder By an Officer $ 300,000        
2019 Convertible Notes [Member] | Chief Executive Officer [Member]          
Conversion of Deferred Compensation into Note Payable Affiliate   $ 150,000      
2019 Convertible Notes [Member] | Convertible Debt [Member]          
Debt Instrument, Interest Rate, Stated Percentage   4.00%      
2019 Convertible Notes [Member] | Convertible Debt [Member] | Chief Executive Officer [Member]          
Debt Instrument, Interest Rate, Stated Percentage   4.00%      
Number of Shares Per Unit   1      
Number of Warrants Per Unit   0.5      
Conversion Price Per Unit   $ 0.50      
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.75      
Debt Instrument, Convertible, Beneficial Conversion Feature   $ 0      
Convertible Notes Payable, Total   150,391      
Conversion of Deferred Compensation into Note Payable Affiliate   $ 150,000