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Note 6 - Stock-based Compensation Plan (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
May 22, 2019
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
May 20, 2019
May 20, 2009
Restricted Stock [Member]              
Share-Based Payment Arrangement, Expense   $ 98,000 $ 115,000 $ 196,000 $ 230,000    
Share-Based Payment Arrangement, Expense, Tax Benefit   23,000 $ 28,000 $ 47,000 $ 55,000    
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   $ 837,000   $ 837,000      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       2 years 2 months 12 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   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