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Note 7 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 08, 2022
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share Price (in dollars per share) $ 77.28          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 4,400     $ 4,400  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         2 years 6 months  
Director [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 9,876          
Share-Based Payment Arrangement [Member]            
Share-Based Payment Arrangement, Expense, Tax Benefit   $ 485 $ 167   $ 1,100 $ 608
Employee and Nonemployee Stock Option [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)         9,876  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 1,100 164
Proceeds from Stock Options Exercised         $ 367 $ 162
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)       0 1,876  
Shares Paid For Tax Withholding For Share Based Compensation, Average Market Price (in dollars per share)         $ 95.82  
Restricted Stock Units (RSUs) [Member]            
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)         19,425 14,112
Shares Paid for Tax Withholding for Share Based Compensation Market Price (in dollars per share)         $ 67.05 $ 52.47