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Note 12 - Share Option and Equity Incentive Plans (Details Textual)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Sep. 10, 2018
USD ($)
shares
Apr. 30, 2017
shares
Dec. 31, 2019
USD ($)
shares
Jun. 30, 2019
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Nov. 30, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares         $ 7.23 $ 6.15  
Payments of Dividends, Total         $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weight of Peer Group Average Volatility Used to Determine Expected Volatility     100.00% 50.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weight of Average Volatility Used to Determine Expected Volatility       50.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeiture Rate         5.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeiture Rate, Management         0.00% 5.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeiture Rate, Non-management         5.00% 5.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 6,500   $ 6,500 $ 2,800  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value     4,400   $ 4,400 $ 2,400  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares         394,078 694,322  
Proceeds from Stock Options Exercised         $ 4,035 $ 3,241  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         1,900 6,700  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value         2,400 3,700  
Share-based Payment Arrangement, Option [Member]              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     4,500   $ 4,500    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition         2 years 182 days    
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number | shares 120,000            
Share-based Payment Arrangement, Expense         $ 2,600 3,600  
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number | shares 28,100            
Restricted Stock and Restricted Stock Units (RSU's) [Member]              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 3,200   $ 3,200    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition         2 years 255 days    
Share-based Payment Arrangement, Expense         $ 1,000 $ 2,000  
Unvested Equity Award [Member]              
Share-based Payment Arrangement, Plan Modification, Number of Grantees Affected 35            
Share-based Payment Arrangement, Plan Modification, Incremental Cost $ 0            
2013 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares   2,684,563         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 | shares     1,552,474   1,552,474    
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] | Share-based Payment Arrangement, 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%