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Real Estate Assets (Summary of Properties Owned) (Parenthetical) (Details) - USD ($)		12 Months Ended
	Jan. 15, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate And Accumulated Depreciation [Line Items]
Real estate asset sold		$ 40,023,572	$ 23,464,380
Morena Office Center [Member] | Subsequent Event [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real estate asset sold	$ 5,600,000

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28(Footnote 4))
-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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