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Note 13 - Stock-based Compensation Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 09, 2022
Aug. 31, 2020
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 3,298     $ 3,298  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           2 years 6 months  
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           $ 550 $ 981
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%          
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%   150.00%   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 Payment Arrangement, Tranche Three [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] | 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