Note 15 - Share-based Compensation - Summary of Stock Options Outstanding (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Beginning Options Outstanding, number of shares (in shares) | shares	17,095
Beginning Options Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 21.60
Exercised, number of shares (in shares) | shares	(2,667)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 18.89
Forfeited and Expired, number of shares (in shares) | shares	(153)
Forfeited and Expired, weighted average exercise price (in dollars per share) | $ / shares	$ 23.39
Ending Options Outstanding, number of shares (in shares) | shares	14,275
Ending Options Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 22.08
Options Outstanding, weighted average remaining contractual term (Year)	7 years 2 months 26 days
Options Outstanding, aggregate intrinsic value | $	$ 305,893
Options Expected to Vest, number of shares (in shares) | shares	14,118
Options Expected to Vest, weighted average exercise price (in dollars per share) | $ / shares	$ 22.10
Options Expected to Vest, weighted average remaining contractual term (Year)	7 years 2 months 19 days
Options Expected to Vest, aggregate intrinsic value | $	$ 302,266
Options Exercisable, number of shares (in shares) | shares	5,961
Options Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 19.86
Options Exercisable, weighted average remaining contractual term (Year)	5 years 6 months 7 days
Options Exercisable, aggregate intrinsic value | $	$ 140,984