Note 4 - Non-operating Income (Details) - Non-operating Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Non-operating Income [Abstract]
Equity in earnings of unconsolidated investments	$ 1,268	$ 1,741	$ 2,386	$ 3,654
Dividends and other net realized gains and losses on sales of securities	1,629	1,432	3,505	2,958
Interest income	1,233	1,108	2,461	2,241
	$ 4,130	$ 4,281	$ 8,352	$ 8,853