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Note 8 - Share-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 01, 2021
Mar. 01, 2020
Dec. 20, 2019
Feb. 01, 2019
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2019
Dec. 31, 2021
Share-Based Payment Arrangement, Expense         $ 988 $ 1,231    
Treasury Stock, Shares, Total (in shares)         4,300,152     4,091,823
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount         $ 6,089      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         1 year 9 months 18 days      
Share-Based Payment Arrangement, Option [Member]                
Share-Based Payment Arrangement, Expense         $ 105 167    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         20      
Restricted Stock Units (RSUs) [Member]                
Share-Based Payment Arrangement, Expense         $ 910 $ 1,105    
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Change in Vested And Unissued Shares (in shares)         45,731      
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Vested and Unissued Outstanding (in shares)         1,737,397      
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)         21,468,344      
Common Stock, Capital Shares Reserved for Future Issuance (in shares)         909,251      
The 2018 Stock Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)             5 years  
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%