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Note 19 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)       500,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 355,000      
Share-based Compensation Arrangement by Share-based Payment Award Liquidity Discount 5.80%      
Proceeds (Used for) and Received from Settlement of Stock Awards $ 233,000 $ 164,000    
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 32,000   30,000  
Stock Appreciation Rights (SARs) [Member] | Share-Based Payment Arrangement, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 5 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 30,000   39,000  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years      
Sharebased Compensation Arrangement by Share-based Payment Award Post Vesting Holding Period (Year) 1 year      
Share-based Compensation Arrangement by Share-based Payment Award Liquidity Discount     6.10%  
Restricted Stock Units (RSUs) [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 12 months      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 5,410 7,758    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Fair Value Granted $ 350,000 $ 315,000