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Note 10 - Options and Warrants to Purchase Common Stock (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Nov. 03, 2014
Dec. 22, 2011
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Nov. 20, 2012
Warrants Issued   5,000,000     0 0  
Stock Issued During Period, Shares, New Issues   10,000,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 2   $ 0.36      
Warrants Cancelled During Period, Writeoff to Derivative Liability and Equity $ 120,000            
Unrealized Gain (Loss) on Derivatives       $ 0 $ 0 $ 830,000  
Class of Warrant or Right, Expired During Period       267,769      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       3,771,488 988,355    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price       $ 0.24 $ 0.63    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options       $ 145,899      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       4 years 43 days      
Employee Stock Option [Member]              
Allocated Share-based Compensation Expense       $ 554,288 $ 397,417 $ 865,716  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 0      
LTIP [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized             8,900,000
Private Placement [Member]              
Warrants Issued     3,283,283 3,283,283      
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 0.25