Income Taxes (Components of Net Income Tax Asset) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Capital loss carryforward	$ 0	$ 830
Net operating loss carryforward	3,899	5,088
Gross deferred tax assets	3,899	5,918
Valuation allowance	(3,858)	(5,743)
Total deferred tax assets	41	175
Deferred tax liabilities:
Built-in gain	(41)	(175)
Total deferred tax liabilities	(41)	(175)
Net deferred tax asset	$ 0	$ 0