Note 2 - Stock-Based Compensation (Detail) - 2004 Plan Option Plan Status (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Outstanding at		4,863,239
Outstanding at (in Dollars per share)		$ 15.31
Outstanding at	3 years 29 days	3 years 160 days
Outstanding at (in Dollars)		$ 8,817,049
Options exercisable at June 30, 2012 and expected to become exercisable	4,127,134
Options exercisable at June 30, 2012 and expected to become exercisable (in Dollars per share)	$ 15.91
Options exercisable at June 30, 2012 and expected to become exercisable (in Dollars)	18,465,230
Options exercisable at June 30, 2012 and expected to become exercisable	3 years 21 days
Options vested and exercisable at June 30, 2012	3,768,592
Options vested and exercisable at June 30, 2012 (in Dollars per share)	$ 15.83
Options vested and exercisable at June 30, 2012 (in Dollars)	17,125,148
Options vested and exercisable at June 30, 2012	2 years 328 days
Options granted (weighted-average fair value of $6.69 per share)	7,000
Options granted (weighted-average fair value of $6.69 per share) (in Dollars per share)	$ 15.96
Options exercised	(661,843)
Options exercised (in Dollars per share)	$ 11.09
Options forfeited and expired	(59,041)
Options forfeited and expired (in Dollars per share)	$ 20.69
Outstanding at	4,149,355
Outstanding at (in Dollars per share)	$ 15.91
Outstanding at (in Dollars)	$ 18,556,231