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Note 4 - Non-operating Income (Details) - Non-operating Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Non-operating Income [Abstract]
Equity in earnings of unconsolidated investments	$ 1,119	$ 1,913
Dividends and other net realized gains and losses on sales of securities	1,876	1,526
Interest income	1,227	1,133
	$ 4,222us-gaap_OtherNonoperatingIncome	$ 4,572us-gaap_OtherNonoperatingIncome

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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