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Note 10 - Share Option and Equity Incentive Plan (Details Textual) - USD ($)
12 Months Ended 84 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2014
Nov. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 4.53 $ 6.33 $ 9.32    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeiture Rate 5.00% 5.00% 5.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 19,200,000 $ 12,600,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 15,600,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 85,943 41,222 65,054    
Proceeds from Stock Options Exercised $ 76,000 $ 20,000 $ 14,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 1,000,000 500,000 900,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 2,900,000 1,900,000 1,000,000    
Payments of Dividends 0        
Employee Stock Option [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 5,000,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 146 days        
Allocated Share-based Compensation Expense $ 3,200,000 2,400,000 1,600,000    
Restricted Stock Units (RSUs) [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 3,300,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 328 days        
Allocated Share-based Compensation Expense $ 1,800,000 $ 1,100,000 $ 900,000    
2013 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         2,684,563
Share-based Compensation Arrangement by Share-based Payment Award, Automatic Increase, Percentage of Shares Outstanding         4.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2,004,074        
2013 Plan [Member] | Until Second Aniversary of Vesting Start Date of Employee First Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       0.00%  
2013 Plan [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years        
2013 Plan [Member] | Restricted Stock Units (RSUs) [Member] | Second Anniversary of Grant Date [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 40.00%        
2013 Plan [Member] | Restricted Stock Units (RSUs) [Member] | Third Anniversary of Grant Date [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 30.00%        
2013 Plan [Member] | Restricted Stock Units (RSUs) [Member] | Fourth Anniversary of Grant Date [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 30.00%