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Note 6 - Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Dec. 18, 2014
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2009
Note 6 - Stock Based Compensation (Details) [Line Items]        
Allocated Share-based Compensation Expense   $ 37 $ 33  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) 165,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 2.29      
Employee Stock Option [Member]        
Note 6 - Stock Based Compensation (Details) [Line Items]        
Allocated Share-based Compensation Expense   19 18  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 2.01%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 7 years 6 months      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 26.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 0.00%      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 282    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   3 years 9 months    
Restricted Stock [Member]        
Note 6 - Stock Based Compensation (Details) [Line Items]        
Allocated Share-based Compensation Expense   $ 18 $ 15  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 165    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)       132,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)   10,723 8,670  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)   $ 9.45 $ 7.70