Note 2 - Stock-Based Compensation (Detail) - 2004 Plan Option Plan Status (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Outstanding at		4,863,239
Outstanding at (in Dollars per share)		$ 15.31
Outstanding at	2 years 292 days	3 years 160 days
Outstanding at (in Dollars)		$ 8,817,049
Options exercisable at September 30, 2012 and expected to become exercisable	3,726,760
Options exercisable at September 30, 2012 and expected to become exercisable (in Dollars per share)	$ 16.25
Options exercisable at September 30, 2012 and expected to become exercisable (in Dollars)	15,306,445
Options exercisable at September 30, 2012 and expected to become exercisable	2 years 288 days
Options vested and exercisable at September 30, 2012	3,472,405
Options vested and exercisable at September 30, 2012 (in Dollars per share)	$ 16.21
Options vested and exercisable at September 30, 2012 (in Dollars)	14,395,333
Options vested and exercisable at September 30, 2012	2 years 233 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	(1,053,687)
Options exercised (in Dollars per share)	$ 11.61
Options forfeited and expired	(73,270)
Options forfeited and expired (in Dollars per share)	$ 20.85
Outstanding at	3,743,282
Outstanding at (in Dollars per share)	$ 16.24
Outstanding at (in Dollars)	$ 15,375,791