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Note 6 - Stock-based Compensation Plans (Details Textual) - USD ($)
3 Months Ended
Feb. 18, 2020
May 20, 2009
Mar. 31, 2021
Mar. 31, 2020
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)     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 $ 93,000    
Share-based Payment Arrangement, Expense, Tax Benefit     $ 28,000 $ 28,000    
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     $ 1,400,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     3 years 4 months 24 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      
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