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Note 8 - Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Details      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 426    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 69 52 61
Share-based Payment Arrangement, Exercise of Option, Tax Benefit $ 7 $ 23 $ 49
Share-based Payment Arrangement, Expense $ 160 113 $ 64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 16.17   $ 15.77
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 432    
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized To Be Recognized Over The Next Twelve Months $ 164    
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized To Be Recognized Over The Next Twelve Months Period For Recognition 12 months    
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized To Be Recognized Over The Next 3 Years $ 267    
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized To Be Recognized Over The Next 3 Years Period For Recognition 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 371 354 $ 812
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 1,178 $ 2,553 $ 1,605