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Note 7 - Convertible Notes Payable - Affiliates (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Nov. 07, 2017
Jun. 30, 2017
Jun. 30, 2016
Feb. 10, 2015
Convertible Notes Payable, Noncurrent $ 3,498,901   $ 3,498,901     $ 3,316,060    
Interest Expense, Total $ 84,714 $ 94,640 $ 276,815 $ 281,969        
Chief Executive Officer [Member]                
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1.50   $ 1.50          
President [Member]                
Class of Warrant or Right, Exercise Price of Warrants or Rights               $ 1.50
January 2015 Convertible Notes [Member] | Convertible Debt [Member]                
Debt Instrument, Interest Rate, Stated Percentage 4.00%   4.00%          
Number of Shares Per Unit 1   1          
Number of Warrants Per Unit 0.25   0.25          
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 1,654,736 1,596,155 1,654,736 1,596,155        
January 2015 Convertible Notes [Member] | Convertible Debt [Member] | President [Member]                
Convertible Notes Payable, Noncurrent 859,282 828,861 859,282 828,861        
January 2015 Convertible Notes [Member] | Convertible Debt [Member] | Executive Vice Chairman [Member]                
Convertible Notes Payable, Noncurrent $ 427,416 412,284 $ 427,416 412,284        
September 2015 Convertible Notes [Member] | Chief Executive Officer [Member]                
Convertible Notes Payable, Total             $ 405,831  
September 2015 Convertible Notes [Member] | Executive Vice Chairman [Member]                
Convertible Notes Payable, Total             82,921  
September 2015 Convertible Notes [Member] | Chief Financial Officer [Member]                
Convertible Notes Payable, Total             $ 16,382  
September 2015 Convertible Notes [Member] | Convertible Debt [Member]                
Debt Instrument, Interest Rate, Stated Percentage 4.00%   4.00%          
Conversion Price Per Unit $ 0.60   $ 0.60          
Debt Instrument, Convertible, Beneficial Conversion Feature     $ 0          
Interest Expense, Total $ 5,341 4,983 15,743 15,168        
September 2015 Convertible Notes [Member] | Convertible Debt [Member] | Chief Executive Officer [Member]                
Convertible Notes Payable, Total 447,989 431,181 447,989 431,181        
September 2015 Convertible Notes [Member] | Convertible Debt [Member] | President [Member]                
Convertible Notes Payable, Total 18,061 17,405 18,061 17,405        
September 2015 Convertible Notes [Member] | Convertible Debt [Member] | Executive Vice Chairman [Member]                
Convertible Notes Payable, Total 91,417 $ 88,101 91,417 $ 88,101        
Replacement Note Held as Collateral [Member] | Chief Executive Officer [Member]                
Convertible Notes Payable, Total $ 130,000   $ 130,000   $ 130,000