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Note 14 - Share-based Compensation (Details Textual)
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Mulitplier for Pre-merger Common Stock 19.3678009  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ $ 144,000 $ 137,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 0.11  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 32,177,804  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ $ 2,800,000  
Share-based Compensation | $ $ 942,000 $ 283,000
Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 26,287,617 0
Consultants [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 5,890,187  
Non-employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares   0
Share-based Compensation | $ $ 545,000 $ 10,000
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years 219 days