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Note 6 - Stock Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jul. 11, 2016
Jun. 11, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2009
Allocated Share-based Compensation Expense     $ 36 $ 37    
Dividends, Common Stock, Stock, Percentge 4.00% 4.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0 0    
Employee Stock Option [Member]            
Allocated Share-based Compensation Expense     $ 18 $ 19    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 194      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 273 days      
Restricted Stock [Member]            
Allocated Share-based Compensation Expense     $ 18 $ 18    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 228      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 137,280         132,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 5,280          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     8,258 11,149 [1]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 9.87 $ 9.09 [1] $ 9.09  
[1] Restated for the 4% stock dividend distributed July 11, 2016.