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Note 9 - Options and Warrants to Purchase Common Stock (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 24, 2016
Dec. 22, 2011
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2013
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Aug. 31, 2013
Nov. 20, 2012
Private Placement [Member]                          
Stock Issued During Period, Shares, New Issues 10,933,339           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 $ 397,417 $ 865,716 $ 4,707,381    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     0       0   6,500        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 328,745       $ 328,745   $ 354,284        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             1 year 98 days   5 years 43 days        
Warrants Issued   5,000,000 0 0         0 0 0    
Stock Issued During Period, Shares, New Issues 10,933,333 10,000,000       3,756,757              
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 2 $ 0.38     $ 1.97 $ 0.38   $ 1.11     $ 1.93  
Intrinsic Value of Outstanding Warrants     $ 0       $ 0            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             2,671,488   1,138,356 1,175,000      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price             $ 0.26   $ 0.63 $ 0.84      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value             $ 0.10