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Note 15 - Stock-based Compensation Plans (Details Textual) - USD ($)
12 Months Ended
Feb. 18, 2020
Feb. 19, 2019
Feb. 20, 2018
May 20, 2009
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 22, 2019
May 20, 2019
Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         14,250        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)         $ 67.43        
Share-based Payment Arrangement, Expense         $ 381,000 $ 288,000 $ 192,000    
Share-based Payment Arrangement, Expense, Tax Benefit         $ 167,000 $ 102,000 $ 37,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)         9,350 6,900 4,200    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value         $ 656,000 $ 353,000 $ 171,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 1,500,000        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         3 years 9 months 18 days        
Restricted Stock [Member] | Officers, Directors and Key Employees [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 14,250 9,750 20,000            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 67.43 $ 52.09 $ 37.42            
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 961,000 $ 508,000 $ 748,000            
Restricted Stock [Member] | Officers, Directors and Key Employees [Member] | Share-based Payment Arrangement, Tranche One [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00% 20.00%              
Restricted Stock [Member] | Officers, Directors and Key Employees [Member] | Vesting Each Year on July 1, Beginning in 2019 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%            
Equity Incentive Plan 2009 [Member] | Common Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)       223,000          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)                 176,150
Equity Incentive Plan 2019 [Member]                  
Maximum Fair Value of First Exercisable Stock Incentive Options       $ 100,000          
Equity Incentive Plan 2019 [Member] | Common Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)               176,150  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)         161,900        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years          
Equity Incentive Plans [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         0