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Note 15 - Stock-based Compensation Plans (Details Textual) - USD ($)
12 Months Ended
Feb. 20, 2024
May 22, 2019
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
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     3,150 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     $ 28        
Share-Based Payment Arrangement, Expense     $ 202,000 $ 252,000 $ 436,000    
Share-Based Payment Arrangement, Expense, Tax Benefit     $ 20,000 $ 30,000 $ 55,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period     3,950 6,100 8,950    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 120,000 $ 188,000 $ 260,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     $ 135,000        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     2 years 7 months 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 3,150            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 28            
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 88,000            
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             223,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant           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   176,150          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant     159,650        
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period   10 years          
Equity Incentive Plans [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     0