Note 11 - Stock-Based Compensation (Detail) - Summary of Outstanding Stock Options (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Options outstanding	1,482,077	472,327
Options outstanding (in Dollars per share)	$ 46.92	$ 43.07
Options exercisable at September 30, 2012	228,407
Options exercisable at September 30, 2012 (in Dollars per share)	$ 46.13
Options exercisable at September 30, 2012 (in Dollars)	$ 706,000
Options granted	64,244	1,264,719
Options granted (in Dollars per share)	$ 44.26	$ 46.58
Options exercised	(130,150)	(224,969)
Options exercised (in Dollars per share)	$ 45.79	$ 37.30
Options cancelled or expired	(85,620)	(30,000)
Options cancelled or expired (in Dollars per share)	$ 52.50	$ 44.25
Options outstanding	1,330,551	1,482,077
Options outstanding (in Dollars per share)	$ 46.54	$ 46.92
Options outstanding (in Dollars)	$ 1,934,000