Note 6 - Stockholders' Equity (Details) - Dividends Declared (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Dividends Payable [Line Items]
Dividends Declared (in thousands)			$ (13,338)
Common Class A [Member]
Dividends Payable [Line Items]
Dividends Declared (in thousands)	$ 6,684	$ 6,622	$ 13,338	$ 13,184
Dividend per share	$ 0.25	$ 0.25	$ 0.50	$ 0.50