Note 9 - Shareholders' Equity (Detail) - Summary of option activity (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Outstanding at January 1, 2012	2,276
Outstanding at January 1, 2012 (in Dollars per share)	$ 49.34
Granted	296
Granted (in Dollars per share)	$ 45.93
Exercised	(185)
Exercised (in Dollars per share)	$ 41.18
Forfeited or expired	(59)
Forfeited or expired (in Dollars per share)	$ 50.43
Outstanding at December 31, 2012	2,328
Outstanding at December 31, 2012 (in Dollars per share)	$ 49.53
Outstanding at December 31, 2012	4 years 292 days
Exercisable at December 31, 2012	1,807
Exercisable at December 31, 2012 (in Dollars per share)	$ 49.65
Exercisable at December 31, 2012	3 years 255 days