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Note 8 - Share-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 01, 2020
Dec. 20, 2019
Feb. 01, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Share-based Payment Arrangement, Expense       $ 1,281 $ 2,954 $ 3,678 $ 5,229  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 10,434   $ 10,434    
Treasury Stock, Shares, Ending Balance (in shares)       3,616,398   3,616,398   2,768,399
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           2 years 7 months 6 days    
Share-based Payment Arrangement, Option [Member]                
Share-based Payment Arrangement, Expense       $ 152 1,252 $ 1,351 2,103  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       473   473    
Restricted Stock Units (RSUs) [Member]                
Share-based Payment Arrangement, Expense       $ 1,176 $ 1,732 $ 2,413 $ 3,171  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Change in Vested And Unissued Shares (in shares)           (525,334)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)           129,999    
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Vested and Unissued Outstanding (in shares)       2,262,001   2,262,001    
Transaction Grants [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Delivered in Period (in shares)           655,333    
The 2015 Stock Incentive Plan and 2018 Stock Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)       21,129,259   21,129,259    
Common Stock, Capital Shares Reserved for Future Issuance (in shares)       1,755,868   1,755,868    
The 2018 Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)           5 years    
The 2018 Stock Incentive Plan [Member] | Vesting if Stock Price is Above 125 Percent of Exercise Price For 20 Consecutive Days [Member] | Share-based Payment Arrangement, Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00% 50.00% 50.00%          
The 2018 Stock Incentive Plan [Member] | Share-based Payment Arrangement, Tranche One [Member] | Share-based Payment Arrangement, Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 133.33% 133.33% 125.00%          
The 2018 Stock Incentive Plan [Member] | Vesting if Stock Price is Above 156 point 25 Percent of Exercise Price For 20 Consecutive Days [Member] | Share-based Payment Arrangement, Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00% 50.00% 50.00%          
The 2018 Stock Incentive Plan [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Share-based Payment Arrangement, Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 177.78% 177.78% 156.25%