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Note 12 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2022
Apr. 30, 2022
Jan. 31, 2022
Jun. 30, 2021
Jun. 30, 2020
May 31, 2019
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2017
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance             5,491,399 3,935,883  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross             4,153,885    
Share-Based Payment Arrangement, Expense             $ 3,225 $ 5,356  
Employment Inducement Grant [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross   1,049,145              
Share-Based Payment Arrangement, Option [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross             4,153,885    
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             5 years 11 months 15 days 5 years 8 months 26 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             2.47% 0.90%  
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount             $ 3,327    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             3 years 4 months 17 days    
Restricted Stock Units (RSUs) [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period   175,173         988,850 398,662  
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount             $ 1,900    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             2 years 1 month 9 days    
The 2017 Stock Incentive Plan [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized 9,000,000               2,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized 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             1,556,291    
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             3,877,169    
The 2017 Stock Incentive Plan [Member] | Performance-based Options [Member]                  
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance             1,614,230    
The 2017 Stock Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]                  
Share-Based Payment Arrangement, Expense             $ 1,770 $ 2,608  
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   1,614,230              
Share Price   $ 2.89              
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term   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   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   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] | Restricted Stock Units (RSUs) [Member]                  
Share-Based Payment Arrangement, Expense             $ 1,455 $ 2,748