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Note 10 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 10, 2021
Aug. 24, 2020
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 2,787 $ 2,787        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       2 years 292 days        
Share-based Payment Arrangement, Amount Capitalized       $ 0 $ 0      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       4 years        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)       $ 5.09 $ 1.55      
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       81,468        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value       $ 244 $ 155      
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] | President [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   141,610            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value   $ 650            
Restricted Stock [Member] | President [Member] | Restricted Stock Vesting in Four Years [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   4 years            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   66,448            
Restricted Stock [Member] | President [Member] | Restricted Stock Vesting in Three Years [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   75,162            
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] | President [Member] | Share-based Payment Arrangement, Tranche One [Member] | Restricted Stock Vesting in Four Years [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%            
Restricted Stock [Member] | President [Member] | Share-based Payment Arrangement, Tranche One [Member] | Restricted Stock Vesting in Three Years [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years            
Restricted Stock [Member] | President [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Restricted Stock Vesting in Four Years [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%            
Restricted Stock [Member] | President [Member] | Share-based Payment Arrangement, Tranche Three [Member] | Restricted Stock Vesting in Four Years [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%            
Restricted Stock [Member] | President [Member] | Share-based Compensation Award, Tranche Four [Member] | Restricted Stock Vesting in Four Years [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%            
Restricted Stock [Member] | President [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%
Restricted Stock [Member] | Members of The Senior Management [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 18,000              
Restricted Stock [Member] | Members of The Senior Management [Member] | Share-based Payment Arrangement, Tranche One [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%