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Note 4 - Non-operating Income - Summary of Non-operating Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity in earnings of unconsolidated investments	$ 1,020	$ 6,932	$ 6,636
Dividends and net realized gains on sale of securities	7,417	7,335	7,547
Interest income	7,183	6,172	5,482
Gain on acquisition of equity method investment	2,050
Total non-operating income	$ 17,670	$ 20,439	$ 19,665

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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