Note 4 - Non-operating Income Component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity in earnings of unconsolidated investments	$ 1,538	$ 1,414	$ 3,924	$ 5,069
Dividends and other net realized gains and losses on sales of securities	1,588	1,392	5,093	4,350
Interest income	1,424	1,131	3,885	3,371
Other non-operating income	$ 4,550	$ 3,937	$ 12,902	$ 12,790