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Note 6 - Stock Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Jul. 11, 2016
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2009
Allocated Share-based Compensation Expense, Total   $ 159 $ 109    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   0   0  
Dividends, Common Stock, Stock, Percentge 4.00%        
Employee Stock Option [Member]          
Allocated Share-based Compensation Expense, Total   $ 53 53    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 78      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year 91 days      
Restricted Stock [Member]          
Allocated Share-based Compensation Expense, Total   $ 106 $ 56    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 367      
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   22,649 8,258    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 11.32 $ 9.87    
2005 Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross