Long-Term Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, net of deferred financing costs	$ 135,810,000	$ 111,097,000
Fixed rate debt	23,603,000	24,317,000
Variable rate debt	$ 115,535,000	99,768,000
Debt to be repaid upon sale of related properties, term	1 year
Debt defaulted	$ 0
Held For Use [Member]
Debt Instrument [Line Items]
Long-term debt, net of deferred financing costs	$ 138,000,000	$ 114,269,000
Weighted average term	2 years 1 month 6 days	3 years 2 months 12 days
Weighted average interest rate	5.15%	4.34%
Fixed rate debt	$ 23,604,000	$ 24,317,000
Fixed rate, weighted average term	1 year 10 months 24 days	2 years 4 months 24 days
Fixed rate, weighted average interest	4.41%	4.41%
Variable rate debt	$ 114,396,000	$ 89,952,000
Variable rate, weighted average term	2 years 10 months 24 days	4 years 1 month 6 days
Variable rate, weighted average interest	5.30%	4.32%
Minimum [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio	1.50
Tangible net worth	$ 55,000,000
Percentage of net offering proceeds added to tangible net worth	80.00%
Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio	60.00%
Leverage ratio after extension option	6.25%
Secured leverage ratio	40.00%
Unhedged variable rate debt	25.00%
Distributions, percentage of funds available aloowed	95.00%