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Note 8 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Share-Based Payment Arrangement, Expense, Tax Benefit $ 394 $ 310 $ 1,900 $ 1,900
Share Price (in dollars per share) $ 260.92   $ 260.92  
Proceeds from Stock Options Exercised     $ 107 680
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 6,700   $ 6,700  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     2 years 6 months  
Employee and Nonemployee Stock Option [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     2,958  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 652,000 3,000
Proceeds from Stock Options Exercised     $ 212 $ 789
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation     653 86
Shares Paid for Tax Withholding for Share Based Compensation Market Price (in dollars per share)     $ 162.93 $ 127.05
Restricted Stock Units (RSUs) [Member]        
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation     21,914 20,457
Shares Paid for Tax Withholding for Share Based Compensation Market Price (in dollars per share)     $ 216.8 $ 117.95
Director [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     2,958