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Note 8 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 0    
Deferred Compensation Plan for Directors [Member]      
Deferred Compensation Arrangement with Individual, Compensation Expense $ 0 $ 0  
Restricted Stock Units (RSUs) [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) 0   45,003
The 2014 Long-term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 5,600,676    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 2,616,298    
Share-based Payment Arrangement, Expense, Tax Benefit $ 0    
The 2014 Long-term Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 0    
The 2014 Long-term Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%    
The 2014 Long-term Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%    
The 2014 Long-term Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%    
The 2014 Long-term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) 0    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 68    
The 2014 Long-term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 2 years    
The 2014 Long-term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 4 years