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Note 7 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 4 Months Ended 6 Months Ended
Jun. 07, 2023
Jun. 30, 2023
Jun. 30, 2022
Jun. 07, 2023
Jun. 30, 2023
Jun. 30, 2022
Share-Based Payment Arrangement, Expense, Tax Benefit   $ 752,000 $ 236,000   $ 1,600 $ 617,000
Proceeds from Stock Options Exercised         680,000 21,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 7,500,000     $ 7,500,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         2 years 9 months  
Employee and Nonemployee Stock Option [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 3,000,000.0 72,000,000
Proceeds from Stock Options Exercised         $ 789,000,000 $ 21,000,000
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 19,425
Shares Paid for Tax Withholding for Share Based Compensation Market Price (in dollars per share)         $ 117.95 $ 67.05
Director [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares) 4,215          
Share Price (in dollars per share) $ 167.98     $ 167.98    
President and Chief Executive Officer [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares)       7,935    
Share Price (in dollars per share) $ 111.54     $ 111.54