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Note 8 - Stock Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   13,000 13,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares, Ending Balance (in shares)   0 0 2,000  
Share Price (in dollars per share)   $ 15.81      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 1,700    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     3 years 8 months 12 days    
Restricted Stock [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   167,000 176,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   173,000 112,000    
The 2019 Plan [Member] | Share-Based Payment Arrangement, Option [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)         1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Pursuant to Exercise of Incentive Stock Options (in shares)         1,000,000
The 2019 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Employee or Consultant [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)         250,000
The 2019 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Non-employee Director [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)         50,000
The 2019 Plan [Member] | Restricted Stock [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)   63,805      
The 2019 Plan [Member] | Restricted Stock [Member] | Board of Directors [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)   35,606 51,155    
Stock Issued During Period, Value, Issued for Services   $ 536 $ 1,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   33,379 46,191    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)   3 months 3 months    
The 2019 Plan [Member] | Restricted Stock [Member] | An Employee [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)   104,871      
Stock Issued During Period, Value, Issued for Services   $ 1,600      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   41,066      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)   3 months      
The 2019 Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)   50,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)   4 years      
The 2019 Plan [Member] | Restricted Stock [Member] | Workforce for Services [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)   28,735      
Stock Issued During Period, Value, Issued for Services   $ 537      
The 2019 Plan [Member] | Restricted Stock [Member] | Certain Key Employees [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)     60,000    
Stock Issued During Period, Value, Issued for Services     $ 1,100    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)     4 years    
The 2019 Plan [Member] | Restricted Stock [Member] | Certain Key Employees [Member] | Share-Based Payment Arrangement, Tranche One [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage     50.00%    
The 2019 Plan [Member] | Restricted Stock [Member] | Certain Key Employees [Member] | Share-Based Payment Arrangement, Tranche Two [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage     6.25%    
Share Purchase Match Program [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Matching Percentage of Common Stock Purchased 20.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Matching of Common Stock Purchased per Individual Within a Calendar Year $ 25        
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)   10,000 5,000    
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture   $ 155 $ 77    
Share Purchase Match Program [Member] | Restricted Stock [Member] | Board of Directors [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)   2,227 4,964    
Share Purchase Match Program [Member] | Restricted Stock [Member] | Chief Executive Officer [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   3,805      
Share Purchase Match Program [Member] | Restricted Stock [Member] | Certain Key Employees [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)     111,000    
Stock Issued During Period, Value, Issued for Services     $ 1,000