Note 6 - Stockholders' Equity - Dividends Declared (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Common Class A [Member]
Dividends Declared (in thousands)		$ 6,644		$ 19,982
Dividend per share (in dollars per share)		$ 0.25		$ 0.75
Dividends Declared (in thousands)			$ 13