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Note 6 - Stock-based Compensation Plans (Details Textual) - USD ($)
3 Months Ended
May 22, 2019
Mar. 31, 2022
Mar. 31, 2021
May 20, 2019
May 20, 2009
Restricted Stock [Member]          
Share-Based Payment Arrangement, Expense   $ 98,000 $ 115,000    
Share-Based Payment Arrangement, Expense, Tax Benefit   $ 23,000 $ 28,000    
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, Total   $ 935,000      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years 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)   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