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Note 8 - Options (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Details      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized 285    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number 84 67 52
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit $ 12,000 $ 6,000 $ 39,000
Share-Based Payment Arrangement, Expense $ 225,000 $ 183,000 166,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 25.09 $ 25.34  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 702,000    
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized To Be Recognized Over The Next Twelve Months $ 225,000    
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 4 Years $ 477    
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    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value $ 31,000 $ 141,000 591,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value $ 814,000 $ 1,812,000 $ 1,595,000