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Note 8 - Share-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 01, 2021
Mar. 01, 2020
Dec. 20, 2019
Feb. 01, 2019
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2019
Jun. 08, 2022
Dec. 31, 2021
Share-Based Payment Arrangement, Expense         $ 801 $ 1,145 $ 2,652 $ 3,577      
Treasury Stock, Shares, Total (in shares)         4,300,152   4,300,152       4,091,823
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount         $ 4,190   $ 4,190        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 year 4 months 24 days        
Share-Based Payment Arrangement, Option [Member]                      
Share-Based Payment Arrangement, Expense         0 105 $ 125 395      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         0   0        
Restricted Stock Units (RSUs) [Member]                      
Share-Based Payment Arrangement, Expense         $ 818 $ 1,063 $ 2,595 $ 3,276      
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        
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)                   15,422,523  
Common Stock, Capital Shares Reserved for Future Issuance (in shares)         10,901,195   10,901,195        
The 2018 Stock Incentive Plan [Member]                      
Common Stock, Capital Shares Reserved for Future Issuance (in shares)         901,195   901,195        
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%