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Note 15 - Stock-based Compensation Plans (Details Textual) - USD ($)
12 Months Ended
May 22, 2019
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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 Payment Arrangement, Expense   $ 252,000 $ 436,000 $ 487,000    
Share-Based Payment Arrangement, Expense, Tax Benefit   $ 30,000 $ 55,000 $ 97,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   6,100 8,950 10,300    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 188,000 $ 260,000 $ 448,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 249,000        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 4 months 24 days        
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)   162,800        
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