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Note 7 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Proceeds from Stock Options Exercised $ 109 $ 0
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 8,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 3 years  
Share-Based Payment Arrangement [Member]    
Share-Based Payment Arrangement, Expense, Tax Benefit $ 839 381
Employee and Nonemployee Stock Option [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value 371 0
Proceeds from Stock Options Exercised $ 109 $ 0
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) 861  
Shares Paid for Tax Withholding for Share Based Compensation Market Price (in dollars per share) $ 127.05  
Restricted Stock Units (RSUs) [Member]    
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) 20,457 19,376
Shares Paid for Tax Withholding for Share Based Compensation Market Price (in dollars per share) $ 117.95 $ 67.02