Note 6 - Stockholders' Equity (Details) - Dividends Declared (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Dividends Payable [Line Items]
Dividends Declared (in thousands)			$ (19,982)
Common Class A [Member]
Dividends Payable [Line Items]
Dividends Declared (in thousands)	$ 6,644	$ 6,634	$ 19,982	$ 19,821
Dividend per share	$ 0.25	$ 0.25	$ 0.75	$ 0.75