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Note 9 - Stockholders' Equity and Stock-based Compensation - Share-based Compensation and Stock Options Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Balance (in shares) 1,838  
Weighted average exercise price, balance (in dollars per share) $ 66.05  
Weighted Average Remaining Contractual Life Balance (Year) 6 years 6 years
Aggregate intrinsic value $ 133,922 $ 130,791
Granted (in shares) 133  
Weighted average exercise price, Granted (in dollars per share) $ 129.01  
Exercised (in shares) [1] (66)  
Weighted average exercise price, Exercised (in dollars per share) $ 38.79  
Canceled (in shares) (44)  
Weighted average exercise price, Canceled (in dollars per share) $ 111.66  
Balance (in shares) 1,861 1,838
Weighted average exercise price, balance (in dollars per share) $ 70.46 $ 66.05
Vested and expected to vest (in shares) 1,676  
Weighted average exercise price, Vested and expected to vest (in dollars per share) $ 65.63  
Vested and Expected to vest, weighted average remaining contractual life (Year) 5 years 8 months 12 days  
Vested and Expected to vest, aggregate intrinsic value $ 128,682  
Exercisable (in shares) 1,163  
Weighted average exercise price, Exercisable (in dollars per share) $ 45.89  
Exercisable, weighted average remaining contractual life (Year) 4 years 3 months 18 days  
Exercisable, aggregate intrinsic value $ 112,258  
[1] Included 348 thousand shares of PSOs.