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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
Net income (in Dollars)	$ 6,592	$ 3,482	$ 9,587	$ 5,375
Denominator:
Weighted average oustanding shares used to compute basic net income per share	34,665	33,846	34,385	34,432
Effect of dilutive securities	1,332	1,057	1,275	1,166
Weighted average oustanding shares used to compute diluted net income per share	35,997	34,903	35,660	35,598
Net income per share - basic (in Dollars per share)	$ 0.19	$ 0.10	$ 0.28	$ 0.16
Net income per share - diluted (in Dollars per share)	$ 0.18	$ 0.10	$ 0.27	$ 0.15