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Note 13 - Stock-based Compensation Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 24, 2023
May 08, 2023
Mar. 08, 2023
Dec. 31, 2022
Mar. 09, 2022
Mar. 08, 2022
Oct. 01, 2021
Jun. 14, 2021
Mar. 10, 2021
Aug. 24, 2020
Aug. 31, 2020
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jun. 21, 2023
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                         2 years      
Share-Based Payment Arrangement, Amount Capitalized                         $ 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)                         $ 9.43 $ 4.53    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value                         $ 3,132 $ 643    
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)                         97,461 123,533    
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%    
Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     18,888   20,493                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value     $ 303   $ 200                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) 40,557                              
Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] | Minimum [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range         0.00% 0.00%                    
Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] | Maximum [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range         150.00% 150.00%                    
Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] | Share-Based Payment Arrangement, Tranche One [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                       100.00% 100.00%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Probable Final Vesting Percentage                       50.00%        
Share-Based Compensation Arrangement by Share-Based Payment Award, Catch-Up Adjustment                         $ 60      
Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] | Vesting Based On Performance Metrics [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%   100.00%                          
Performance-Based 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)             5,000   18,000              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value             $ 59   $ 191              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expected to Forfeit, Outstanding, Number (in shares)       6,000                   6,000    
Performance-Based 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 Rights, Percentage                           100.00%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares)       12,000               6,000 6,000 12,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Probable Final Vesting Percentage                       0.00% 88.00%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Catch-Up Adjustment                         $ 14      
Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Minimum [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range                 0.00%              
Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Maximum [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range                 150.00%              
Performance-Based Restricted Stock [Member] | President of Environmental Technologies [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   5,081                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value   $ 108                            
Performance-Based Restricted Stock [Member] | President of Environmental Technologies [Member] | Minimum [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range   0.00%                            
Performance-Based Restricted Stock [Member] | President of Environmental Technologies [Member] | Maximum [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range   150.00%                            
Performance-Based Restricted Stock [Member] | President of Environmental Technologies [Member] | Share-Based Payment Arrangement, Tranche One [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                         100.00%      
The 2023 Stock Incentive Plan [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)                               350,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)                               1,117,942
Stock Plan 2014 [Member]                                
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount                       $ 2,957 $ 2,957      
Restricted Stock Vesting in Three Years [Member] | Restricted Stock [Member] | Vesting Based On Performance Metrics [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%          
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based Restricted Stock [Member] | Vesting Based On Performance Metrics [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range 150.00%                              
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based Restricted Stock [Member] | President [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, Equity Instruments Other than Options, Granted, Fair Value                   $ 345            
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based Restricted Stock [Member] | President [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Minimum [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range                   0.00%            
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based Restricted Stock [Member] | President [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Maximum [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range                   150.00%            
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based Restricted Stock [Member] | Chief Financial Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               5,953                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value               $ 100                
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] | Share-Based Payment Arrangement, Tranche One [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range       150.00%                        
Restricted Stock Vesting on August 24, 2023 [Member] | Performance-Based Restricted Stock [Member] | Chief Financial Officer [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Probable Final Vesting Percentage               0.00%                
Performance-Based Restricted Stock Vesting on January 1, 2025 [Member] | Performance-Based Restricted Stock [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Catch-Up Adjustment                         $ 20      
Share-Based Compensation Arrangement by Share-Based Payment Award, Additional Award Vesting Rights, Percentage 50.00%                              
Performance-Based Restricted Stock Vesting on January 1, 2025 [Member] | Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Vesting Based On Performance Metrics [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                             100.00%  
Performance-Based Restricted Stock Vesting on January 1, 2025 [Member] | Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Vesting Based On Performance Metrics [Member] | Minimum [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range             0.00%                  
Performance-Based Restricted Stock Vesting on January 1, 2025 [Member] | Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Vesting Based On Performance Metrics [Member] | Maximum [Member]                                
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range             150.00%