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Note 6 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 09, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation   $ 200 $ 205 $ 441 $ 553
Share Price (in dollars per share) $ 57.34        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 3,700   $ 3,700  
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, Grants in Period, Gross (in shares)       10,716  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value       $ 164 757
Proceeds from Stock Options Exercised       $ 162 $ 474
Shares Paid for Exercise Price and Tax Withholding for Share Based Compensation (in shares)       0 0
Restricted Stock Units (RSUs) [Member]          
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)       14,122,000 11,233,000
Shares Paid for Tax Withholding for Share Based Compensation Market Price (in dollars per share)       $ 52.47 $ 49.98
Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 10,716