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Note 9 - Options and Warrants to Purchase Common Stock (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 24, 2016
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Nov. 20, 2012
Private Placement [Member]                
Stock Issued During Period, Shares, New Issues 10,933,333       10,933,339      
Price of Unit $ 0.15              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 3,283,283              
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.25              
Class of Warrant or Right, Expiration Term 5 years              
LTIP [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               8,900,000
Employee Stock Option [Member]                
Allocated Share-based Compensation Expense   $ 238,064   $ 107,660 $ 365,045 $ 207,598    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   0     0      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   $ 328,745     $ 328,745      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         1 year 98 days      
Warrants Issued   0 0       0  
Stock Issued During Period, Shares, New Issues 10,933,333              
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.38     $ 0.38      
Intrinsic Value of Outstanding Warrants   $ 0     $ 0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         2,671,488      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price         $ 0.26      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 0.10