Note 2 - Summary of Significant Accounting Policies (Detail) - Share options activity (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Number of options	109		131
Weighted-average exercise price (in Dollars per share)	$ 35.71		$ 34.00
Weighted-average remaining contractual term	2 years 328 days		3 years 255 days
Aggregate intrinsic value (in Dollars)	$ 1,371	[1]	$ 1,494	[1]
Options exercisable at December 31, 2012	109
Options exercisable at December 31, 2012 (in Dollars per share)	$ 35.71
Options exercisable at December 31, 2012	2 years 328 days
Options exercisable at December 31, 2012 (in Dollars)	$ 1,371	[1]
Exercised	(22)
Exercised (in Dollars per share)	$ 25.70

[1] The intrinsic value represents the amount by which the fair value of shares exceed the option exercise price.