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Marketable Equity Securities - Changes in Marketable Equity Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Notes to Financial Statements |  |
Gross cash proceeds from sales | $ 666 | $ 56
Cost | 88 | 16
Gross gain (loss) on sale included in earnings during the period | 578 | 40
Deferred taxes on gross gain on sale included in earnings | (214) | (15)
Reclassification adjustment to unrealized gain in other comprehensive income for net (gain) loss included in earnings | (364) | (25)
Gross unrealized holding gain (loss) arising during the period included in other comprehensive income (loss) | 442 | 994
Deferred taxes on unrealized holding losses included in other comprehensive (income) loss | (214) | (368)
Net unrealized holding gain | 228 | 626
Other comprehensive income from marketable equity securities | $ (136) | $ 601

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