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Note 10 - Stock Options (Details Textual) - USD ($)
12 Months Ended
Jul. 07, 2016
Jan. 02, 2016
Jul. 27, 2010
Dec. 31, 2016
Dec. 31, 2015
Jul. 18, 2016
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number       4,211,168 3,485,168   3,500,168
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           10,391,711  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       3,525,000 1,123,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 0.28 $ 1.19    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 46,233 $ 63,067   $ 2,785,893
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       0 1,125,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period       2,799,000 13,500    
Proceeds from Stock Options Exercised       $ 198,285    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized       $ 679,881      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 222 days      
General and Administrative Expense [Member]              
Allocated Share-based Compensation Expense       $ 661,924 $ 617,529    
Options with Cashless Exercises [Member]              
Number Of Common Shares Options Exercised         720,333    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period         550,276    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period         170,057    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 1,131,371    
Options with Cash Exercises [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period         404,667    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 423,837    
Proceeds from Stock Options Exercised         $ 198,285    
Option Plan 2010 Member              
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum     15.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   5,719,069          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   38,127,129   2,251,168      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   5 years          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 2,560,000            
Option Plan 2010 Member | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year          
Option Plan 2010 Member | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years          
The 2016 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant           2,391,711  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number       1,960,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           8,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 1,960,000