Note 5 - Stockholders' Equity (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		0 Months Ended	1 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Scenario, Forecast [Member] Common Class A [Member]	Dec. 11, 2012 Common Class A [Member]	Dec. 31, 2012 Common Class A [Member]
Stock Repurchase Program, Authorized Amount (in Dollars)			$ 100.0
Common Stock, Dividends, Per Share, Declared	$ 0.25	$ 0.25		$ 1.00