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Note 13 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 22, 2018
May 24, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years        
Share-based Payment Arrangement, Expense $ 2,260 $ 3,090 $ 2,803    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 2,600        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 10 months 24 days        
Performance Shares [Member]          
Share-based Payment Arrangement, Expense $ 0 $ 0      
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%        
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 150.00%        
The 2014 Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Plan Term 10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,644,875        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 61,443        
The 2016 Incentive Plan, Amended and Restated [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       2,100,000 800,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 934,657