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Note 8 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 01, 2021
Mar. 01, 2020
Dec. 20, 2019
Feb. 01, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
May 13, 2021
Dec. 31, 2020
Share-based Payment Arrangement, Expense         $ 1,201,000 $ 1,281,000 $ 2,432,000 $ 3,678,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 9,998   $ 9,998      
Treasury Stock, Shares, Ending Balance (in shares)         4,068,832   4,068,832     3,945,867
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             2 years 3 months 18 days      
Purchased Shares (in shares)                 50,000  
Share-based Payment Arrangement, Option [Member]                    
Share-based Payment Arrangement, Expense         $ 123,000 152,000 $ 290,000 1,351,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         334,000   334,000      
Restricted Stock Units (RSUs) [Member]                    
Share-based Payment Arrangement, Expense         $ 1,108 $ 1,176 $ 2,213 $ 2,413    
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Change in Vested And Unissued Shares (in shares)             570,335      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)             79,998      
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Vested and Unissued Outstanding (in shares)         1,691,666   1,691,666      
Transaction Grants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Delivered in Period (in shares)             650,333      
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)         21,337,143   21,337,143      
The 2018 Stock Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)         1,509,149   1,509,149      
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%            
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% 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%            
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% 177.78% 156.25%