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Marketable Equity Securities - Changes in Marketable Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Notes to Financial Statements
Cost		$ 38
Realized gain on marketable equity securities sold		221
Proceeds from the sale of marketable equity securities sold		(259)
Purchase of marketable equity securities		477
Gross unrealized (loss) gain recorded in the statement of operations	(441)	128
Change in marketable equity securities at fair value	$ (441)	$ 346

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Amount of increase (decrease) of investment in debt and equity securities, measured at fair value with changes in fair value recognized in net income.

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Amount of unrealized gain (loss) on investment in marketable security.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

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This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity and any gains or losses realized during the period from the sale of investments accounted for under the cost method of accounting and/or investments that are separately or otherwise not categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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