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Note 6 - Stock-based Compensation Plans (Details Textual) - USD ($)
3 Months Ended
Feb. 18, 2020
Feb. 19, 2019
May 20, 2009
Mar. 31, 2020
Mar. 31, 2019
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       $ 93,000 $ 56,000    
Share-based Payment Arrangement, Expense, Tax Benefit       $ 28,000 $ 14,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)       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       $ 1,800,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       4 years      
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          
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          
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 961,000 $ 508,000          
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%          
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