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Note 6 - Stock Option Plan (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Feb. 20, 2018
Feb. 17, 2015
May 20, 2009
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           20,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 37.42  
Allocated Share-based Compensation Expense, Total       $ 57,000 $ 22,000 $ 106,000 $ 43,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period           800  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value           $ 29,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total       $ 854,000   $ 854,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           5 years  
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 20,000 19,500          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 37.42 $ 24.50          
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 748,000 $ 478,000          
Restricted Stock [Member] | Officers, Directors and Key Employees [Member] | Vesting Each Year on July 1, Beginning in 2019 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%            
Equity Incentive Plan 2009 [Member]              
Maximum Fair Value of First Exercisable Stock Incentive Options     $ 100,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           0  
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       184,000   184,000  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years