Note 4 - Net Income Per Share (Details) - Net Income Per Share Basic And Diluted (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net Income Per Share Basic And Diluted [Abstract]
Net income (in Dollars)	$ 9,018	$ 2,499
Weighted average outstanding shares used to compute basic net income per share	38,470	36,259
Effect of dilutive securities	1,047	1,449
Weighted average outstanding shares used to compute diluted net income per share	39,517	37,708
Net income per share - basic (in Dollars per share)	$ 0.23	$ 0.07
Net income per share - diluted (in Dollars per share)	$ 0.23	$ 0.07