Note 5 - Net Income per Share (Detail) - Net Income Per Share Basic And Diluted (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income (in Dollars)	$ 2,499	$ 2,995
Weighted average outstanding shares used to compute basic net income per share	36,259	34,105
Effect of dilutive securities	1,449	1,433
Weighted average outstanding shares used to compute diluted net income per share	37,708	35,538
Net income per share - basic (in Dollars per share)	$ 0.07	$ 0.09
Net income per share - diluted (in Dollars per share)	$ 0.07	$ 0.08