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Marketable Equity Securities - Changes in Marketable Equity Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	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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Amount of other deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. For example, but not limited to, acquisition-date income tax benefits or expenses recognized from changes in the acquirer's valuation allowance for its previously existing deferred tax assets resulting from a business combination and adjustments to beginning-of-year balance of a valuation allowance because of a change in circumstance causing a change in judgment about the realizability of the related deferred tax asset in future periods.

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

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