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Note 5 - Stock Option Plan (Details Textual) - USD ($)
3 Months Ended
Feb. 17, 2015
May 20, 2009
Mar. 31, 2017
Mar. 31, 2016
Restricted Stock [Member]        
Allocated Share-based Compensation Expense     $ 21,000 $ 21,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 279,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years 91 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 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      
Equity Incentive Plan 2009 [Member]        
Maximum Fair Value of First Exercisable Stock Incentive Options   $ 100,000    
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  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years