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Marketable Equity Securities - Marketable Equity Securities and Accumulated OCI (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
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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