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Note 15 - Stock-based Compensation Plans (Details Textual) - USD ($)
12 Months Ended
Feb. 18, 2020
May 22, 2019
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 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 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     $ 436,000 $ 487,000 $ 381,000      
Share-Based Payment Arrangement, Expense, Tax Benefit     $ 55,000 $ 97,000   $ 167,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)     8,950 10,300 9,350      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 260,000 $ 448,000 $ 656,000      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 549,000          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     2 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)     162,350          
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