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Note 13 - Stock-based Compensation Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 09, 2022
Aug. 31, 2020
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 3,970   $ 3,970  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         2 years 8 months 12 days  
Share-based Payment Arrangement, Amount Capitalized     0 $ 0 $ 0 $ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)         $ 4.53 $ 5.70
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value         $ 436 $ 577
Share-Based Payment Arrangement, Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)         10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         4 years  
Restricted Stock [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         123,533  
Restricted Stock [Member] | Restricted Stock Vesting in Three Years [Member]            
Share-Based Payment Arrangement, Accelerated Cost     $ 130      
Restricted Stock [Member] | Vesting Based On Performance Metrics [Member] | Restricted Stock Vesting in Three Years [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   100.00% 150.00%      
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range   0.00%        
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range   150.00%        
Restricted Stock [Member] | Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         4 years  
Restricted Stock [Member] | Independent Directors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         1 year  
Restricted Stock [Member] | Independent Directors [Member] | Share-Based Payment Arrangement, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         25.00%  
Restricted Stock [Member] | Independent Directors [Member] | Share-Based Payment Arrangement, Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         25.00%  
Restricted Stock [Member] | Independent Directors [Member] | Share-based Compensation Award, Tranche Four [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         25.00%  
Restricted Stock [Member] | Independent Directors [Member] | Share-Based Payment Arrangement, Tranche Three [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         25.00%  
Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         100.00%  
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range 0.00%          
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range 150.00%          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 20,493          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Value $ 200