Note 2 - Summary of Significant Accounting Policies (Details) - Stock Option Activity (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Stock Option Activity [Abstract]
Outstanding - Number of options	9,463,657	7,371,304		5,058,525
Outstanding - Weighted average exercise price (in Dollars per share)	$ 11.76	$ 12.48		$ 7.29
Outstanding - Weighted average remaining contractual life	7 years 109 days
(in Dollars)	$ 128,711
Exercisable at December 31, 2013	4,737,944
Exercisable at December 31, 2013 (in Dollars per share)	$ 11.29
Exercisable at December 31, 2013	6 years 292 days
Exercisable at December 31, 2013 (in Dollars)	88,008
Expected to vest after December 31, 2013	2,207,281
Expected to vest after December 31, 2013 (in Dollars per share)	$ 14.20
Expected to vest after December 31, 2013	8 years 73 days
Expected to vest after December 31, 2013 (in Dollars)	$ 34,598
Options granted - Number	621,100	2,933,701	3,173,900
Options granted - Weighted average exercise price (in Dollars per share)	$ 18.16	$ 10.28	$ 19.64
Options forfeited - Number	(520,139)	(552,228)	(402,220)
Options forfeited - Weighted average exercise price (in Dollars per share)	$ 15.38	$ 15.28	$ 12.22
Options exercised - Number	(2,229,873)	(289,120)	(458,901)
Options exercised- Weighted average exercise price (in Dollars per share)	$ 10.85	$ 8.46	$ 5.00
Outstanding - Number of options	7,334,745	9,463,657	7,371,304	5,058,525
Outstanding - Weighted average exercise price (in Dollars per share)	$ 12.33	$ 11.76	$ 12.48	$ 7.29