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Marketable Equity Securities - Marketable Equity Securities and Accumulated OCI (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Notes to Financial Statements
Marketable equity at cost	$ 1,714	$ 1,714
Unrealized gain on marketable equity securities	266	929
Marketable equity securities at fair value	$ 1,980	$ 2,643

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Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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Cost of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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