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Note 6 - Stock Option Plan (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Feb. 17, 2015
May 20, 2009
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2016
Equity Incentive Plan 2009 [Member] | Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   223,000      
Equity Incentive Plan 2009 [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years      
Equity Incentive Plan 2009 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       0  
Maximum Fair Value of First Exercisable Stock Incentive Options   $ 100,000      
Restricted Stock [Member] | Officers, Directors and Key Employees [Member] | Vesting each Year on July 1 [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        
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period        
Allocated Share-based Compensation Expense     $ 19,000   $ 39,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period         500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value         $ 16,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options     $ 343,000   $ 343,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         4 years