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Note 10 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2022
Apr. 30, 2022
Jan. 31, 2022
Jun. 30, 2021
Jun. 30, 2020
May 31, 2019
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Mar. 31, 2017
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 5,688,276           5,688,276   5,688,276   3,935,883  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                 2,559,639      
Share-Based Payment Arrangement, Expense             $ 727 $ 2,148 $ 1,756 $ 3,007    
Employment Inducement Grant [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   1,049,145                    
Share-Based Payment Arrangement, Option [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate                 0.00% 0.00%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)                 1 year 9 months 25 days 5 years 8 months 12 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate                 49.00% 50.00%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                 1.09% 0.92%    
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 4,590           4,590   $ 4,590      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                 3 years 6 months      
Restricted Stock Units (RSUs) [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   175,173             619,817      
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 2,366           $ 2,366   $ 2,366      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                 2 years 4 months 24 days      
The 2017 Stock Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 9,000,000           9,000,000   9,000,000     2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 1,500,000     1,500,000 1,900,000 2,100,000            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 1,711,281           1,711,281   1,711,281      
Share-Based Payment Arrangement, Accelerated Cost     $ 242                  
The 2017 Stock Incentive Plan [Member] | Service-based Options [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 4,074,046           4,074,046   4,074,046      
The 2017 Stock Incentive Plan [Member] | Performance Shares [Member] | Chief Executive Officer and President [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   1,614,230                    
Share Price (in dollars per share)   $ 2.89                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)   10 years                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate   49.00%                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   2.90%                    
The 2017 Stock Incentive Plan [Member] | Performance Shares [Member] | Chief Executive Officer and President [Member] | Minimum [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period (Year)   4 years                    
The 2017 Stock Incentive Plan [Member] | Performance Shares [Member] | Chief Executive Officer and President [Member] | Maximum [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period (Year)   7 years                    
The 2017 Stock Incentive Plan [Member] | Performance Shares [Member] | Chief Executive Officer and President [Member] | Share-Based Payment Arrangement, Tranche One [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vesting, Sustained Market Capitalization   $ 250,000                    
The 2017 Stock Incentive Plan [Member] | Performance Shares [Member] | Chief Executive Officer and President [Member] | Share-Based Payment Arrangement, Tranche Two [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vesting, Sustained Market Capitalization   500,000                    
The 2017 Stock Incentive Plan [Member] | Performance Shares [Member] | Chief Executive Officer and President [Member] | Share-Based Payment Arrangement, Tranche Three [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vesting, Sustained Market Capitalization   $ 1,000,000                    
The 2017 Stock Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]                        
Share-Based Payment Arrangement, Expense             $ 408 689 $ 1,145 $ 1,228    
The 2017 Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]                        
Share-Based Payment Arrangement, Expense             $ 319 $ 1,459 $ 611 $ 1,779