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Note 10 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Aug. 24, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 1,544     $ 1,544  
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   $ 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)         $ 1.48 $ 2.75
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         229,110  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value         $ 296 $ 370
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          
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          
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%          
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%          
Share-based Payment Arrangement, Option [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, Expiration Period (Year)         10 years