Note 5 - Stock-Based Compensation (Detail) - Stock Options (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Balance, December 31, 2011	4,356,985
Balance, December 31, 2011 (in Dollars per share)	$ 28.86
Balance, December 31, 2011	3 years
Balance, December 31, 2011 (in Dollars)	$ 37
Balance, March 31, 2012	4,067,695
Balance, March 31, 2012 (in Dollars per share)	$ 29.40
Balance, March 31, 2012	3 years
Balance, March 31, 2012 (in Dollars)	65
Exercisable, March 31, 2012	3,959,668
Exercisable, March 31, 2012 (in Dollars per share)	$ 29.57
Exercisable, March 31, 2012	2 years 11 months
Exercisable, March 31, 2012 (in Dollars)	$ 65
Exercised	(39,784)
Exercised (in Dollars per share)	$ 16.28
Forfeited	(249,506)
Forfeited (in Dollars per share)	$ 22.27