Note 8 - Shareholders' Equity (Details) - Summary of option activity (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Summary of option activity [Abstract]
Outstanding at January 1, 2013	2,328
Outstanding at January 1, 2013 (in Dollars per share)	$ 49.53
Granted	322
Granted (in Dollars per share)	$ 43.71
Exercised	(478)
Exercised (in Dollars per share)	$ 44.98
Forfeited or expired	(94)
Forfeited or expired (in Dollars per share)	$ 49.80
Outstanding at December 31, 2013	2,078
Outstanding at December 31, 2013 (in Dollars per share)	$ 49.66
Outstanding at December 31, 2013	4 years 328 days
Exercisable at December 31, 2013	1,515
Exercisable at December 31, 2013 (in Dollars per share)	$ 51.25
Exercisable at December 31, 2013	3 years 219 days