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Marketable Equity Securities - Marketable Equity Securities and Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Notes to Financial Statements
Marketable equity securities at fair value	$ 1,339	$ 202
Cost	274	91
Accumulated other comprehensive income for unrealized holding gains	1,065	111
Deferred taxes on accumulated other comprehensive income for unrealized holding gains	353
Accumulated other comprehensive income	$ 712	$ 111

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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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