Summary of Significant Accounting Policies (Reconciliation of Net Income (Loss) Reported in Financial Statements and Federal Tax Return) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Summary of Significant Accounting Policies [Abstract]
Net (loss) income	$ (415)	$ 1,445
Adjustment to depreciation expense	(473)	70
Provision for losses and doubtful accounts	3	2
Adjustments to (expenses) revenues	(13)	(65)
Adjustments to gain on sales of assets	2,021	314
Other	785	46
Income per federal tax return (unaudited)	$ 1,908	$ 1,812