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Note 15 - Share-based Payments (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Employee Stock Option [Member]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 1,431,868  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years  
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount $ 0  
Allocated Share-based Compensation Expense $ 200,228 $ 125,048