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Note 9 - Stock-based Compensation Plan (Details Textual) - USD ($)
3 Months Ended
May 22, 2019
Mar. 31, 2025
Mar. 31, 2024
May 20, 2019
May 20, 2009
Restricted Stock [Member]          
Share-Based Payment Arrangement, Expense   $ 38,000 $ 78,000    
Share-Based Payment Arrangement, Expense, Tax Benefit   $ 9,000 $ 18,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   0 0    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 244,000      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   4 years 3 months 18 days      
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   155,750      
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