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Note 13 - Stock Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 11, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 20, 2006
Allocated Share-based Compensation Expense, Total   $ 315 $ 148    
Dividends, Common Stock, Stock, Percentge 4.00%     4.00%  
Employee Stock Option [Member]          
Allocated Share-based Compensation Expense, Total   77 71    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   54      
Restricted Stock [Member]          
Allocated Share-based Compensation Expense, Total   238 $ 77    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 235      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 137,280        
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, Weighted Average Grant Date Fair Value   $ 11.32 $ 10.24    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   22,649 13,258    
2005 Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   0 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         550,000