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Note 6 - Stock Option Plan (Details Textual) - USD ($)
3 Months Ended
Feb. 17, 2015
May. 20, 2009
Mar. 31, 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]      
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    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
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     $ 21,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options     $ 362,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     4 years 91 days