Note 7 - Stockholders' Equity (Detail) - Schedule of Share-based Compensation, Stock Options, Activity (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Outstanding, January 1, 2012	3,872
Outstanding, January 1, 2012 (in Dollars per share)	$ 5.91
Outstanding, June 30, 2012	4,601
Outstanding, June 30, 2012 (in Dollars per share)	$ 6.58
Outstanding, June 30, 2012	7 years 127 days
Outstanding, June 30, 2012 (in Dollars)	$ 15,994
Vested and expected to vest, June 30, 2012	4,221
Vested and expected to vest, June 30, 2012 (in Dollars per share)	$ 6.53
Vested and expected to vest, June 30, 2012	7 years 65 days
Vested and expected to vest, June 30, 2012 (in Dollars)	14,955
Exercisable, June 30, 2012	2,196
Exercisable, June 30, 2012 (in Dollars per share)	$ 6.55
Exercisable, June 30, 2012	5 years 211 days
Exercisable, June 30, 2012 (in Dollars)	$ 8,138
Granted	1,085
Granted (in Dollars per share)	$ 8.52
Exercised	(199)
Exercised (in Dollars per share)	$ 4.41
Canceled	(135)
Canceled (in Dollars per share)	$ 6.16
Expired	(22)
Expired (in Dollars per share)	$ 7.78