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Note 6 - Stock-based Compensation Plans (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Feb. 18, 2020
May 22, 2019
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
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      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)           $ 0      
Share-based Payment Arrangement, Expense     $ 129,000 $ 92,000   $ 359,000 $ 289,000    
Share-based Payment Arrangement, Expense, Tax Benefit     18,000 $ 92,000   $ 73,000 $ 145,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)           8,350 9,350    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value           $ 371,000 $ 656,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 1,200,000     $ 1,200,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           2 years 10 months 24 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 (in shares) 14,250                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 67.43                
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 961,000                
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 (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