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Note 10 - Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Details      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 307    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 61 54 75
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 49 $ 38 $ 50
Allocated Share-based Compensation Expense $ 64 $ 129 $ 92
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 15.77   $ 12.15
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 353    
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized To Be Recognized Over The Next 1.75 Years $ 76    
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized To Be Recognized Over The Next 1.75 Years Period For Recognition 1 year 9 months    
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized To Be Recognized Over The Next 4 Years $ 277    
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized To Be Recognized Over The Next 4 Years Period For Recognition 4 years