Note 5 - Stockholders' Equity (Details Textual) (USD $) In Billions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Mar. 31, 2014	Dec. 31, 2013	Dec. 11, 2011
Common Stock, Dividends, Per Share, Declared		$ 0.25
Common Class A [Member]
Stock Repurchase Program, Authorized Amount				$ 0.1
Common Stock, Dividends, Per Share, Declared	$ 1	$ 0.25	$ 0.25