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Note 6 - Stock-based Compensation Plan (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Feb. 18, 2020
Feb. 19, 2019
May 20, 2009
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
May 22, 2019
May 20, 2019
Restricted Stock [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      
Share-based Payment Arrangement, Expense       $ 104,000 $ 62,000 $ 197,000 $ 118,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)           750      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value           $ 54,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 1,700,000   $ 1,700,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           3 years 9 months 18 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 9,750              
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 $ 52.09              
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 961,000 $ 508,000              
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% 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