Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Impairment of Real Estate	$ 1,267	$ 2,051
Other - Temporary Differences	233	433
Valuation Allowance	(984)	(2,181)
Total Deferred Income Tax Assets, Net of Allowance	516	303
Straight-line Rent	(40)	(51)
Basis Difference - Real Estate Properties	488	260
Other - Temporary Differences	(172)	(186)
Total Deferred Income Tax Liabilities	(700)	(497)
Total Net Deferred Income Tax Liabilities	$ (184)	$ (194)