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Note 15 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
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)     397,000      
Proceeds (Used for) and Received from Settlement of Stock Awards     $ 224,000 $ 272,000    
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)     48,000   53,000  
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)     36,000   40,000  
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     4.40%   4.10%  
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) 6,570 9,834        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Fair Value Granted $ 270,000 $ 247,000