Note 10 - Stockholders' Equity and Stock-based Compensation - Share-based Compensation and Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Balance (in shares)		2,215
Weighted average exercise price, balance (in dollars per share)		$ 59.07
Weighted Average Remaining Contractual Life Balance (Year)		6 years	6 years 6 months
Aggregate intrinsic value		$ 130,791	$ 139,121
Granted (in shares)		495
Weighted average exercise price, granted (in dollars per share)		$ 112.43
Exercised (in shares)	[1]	(725)
Weighted average exercise price, exercised (in dollars per share)		$ 68.91
Canceled (in shares)		(147)
Weighted average exercise price, canceled (in dollars per share)		$ 102.92
Balance (in shares)		1,838	2,215
Weighted average exercise price, balance (in dollars per share)		$ 66.05	$ 59.07
Vested and expected to vest (in shares)		1,659
Vested and Expected to vest, weighted average exercise price (in dollars per share)		$ 61.43
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		$ 125,769
Exercisable (in shares)		1,168
Exercisable, Weighted average exercise price (in dollars per share)		$ 42.60
Exercisable, weighted average remaining contractual life (Year)		4 years 3 months 18 days
Exercisable, aggregate intrinsic value		$ 110,495

[1] Included 348 thousand shares of PSOs.