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Marketable Equity Securities - Marketable Equity Securities and Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Notes to Financial Statements
Marketable equity securities at fair value	$ 1,685	$ 1,339
Cost	713	274
Accumulated other comprehensive (loss) income for unrealized holding gains	972	1,065
Deferred taxes on accumulated other comprehensive income for unrealized holding gains	(353)	(353)
Accumulated other comprehensive income	$ 619	$ 712

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses in other comprehensive income.

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