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Note 5 - Stock Option Plan (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Feb. 17, 2015
May 20, 2009
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         0  
Allocated Share-based Compensation Expense     $ 22,000 $ 19,000 $ 43,000 $ 39,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 257,000   $ 257,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         3 years  
Restricted Stock [Member] | Vesting each Year on July 1, Beginning July 1, 2016 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%          
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 19,500          
Share Price $ 24.50          
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 478,000          
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     204,000   204,000  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years