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Marketable Equity Securities - Marketable Equity Securities and Accumulated OCI (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Notes to Financial Statements |  |
Marketable equity securities at fair value | $ 2,643 | $ 1,339
Cost | 1,714 | 274
Accumulated other comprehensive income for unrealized holding gains | 929 | 1,065
Deferred taxes on accumulated other comprehensive income for unrealized holding gains | 353 | 353
Accumulated other comprehensive income | $ 576 | $ 712

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