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Note 6 - Stock-based Compensation Plans (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Feb. 18, 2020
May 22, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
May 20, 2019
May 20, 2009
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         0      
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)         $ 0      
Share-based Payment Arrangement, Expense     $ 115,000 $ 104,000 $ 230,000 $ 197,000    
Share-based Payment Arrangement, Expense, Tax Benefit     28,000 $ 25,000 $ 55,000 $ 53,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)         (0) 750    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value           $ 54,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 1,300,000   $ 1,300,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         3 years 1 month 6 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              
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              
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 961,000              
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%              
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   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