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Note 15 - Stock-based Compensation Plans (Details Textual) - USD ($)
12 Months Ended
Feb. 18, 2020
May 22, 2019
Feb. 19, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 30, 2020
Dec. 31, 2019
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       $ 487,000 $ 381,000   $ 288,000    
Share-based Payment Arrangement, Expense, Tax Benefit       $ 97,000   $ 167,000 $ 102,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)       10,300 9,350   6,900    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value       $ 448,000 $ 656,000   $ 353,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 1,000,000.0          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       2 years 8 months 12 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            
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