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Recent Real Estate Transactions (Disposals of Properties) (Details)			3 Months Ended
	Mar. 31, 2017 USD ($) Property	Feb. 27, 2017 USD ($)	Mar. 31, 2018 USD ($) Property	Mar. 31, 2017 USD ($) Property	Dec. 31, 2017 USD ($)
Real Estate Properties [Line Items]
Mortgage notes issued for property acquired			$ 164,096,436		$ 160,322,737
Residential Properties [Member] | Nineteen Dubose Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Property			19
Purchase price of property acquired			$ 7,300,000
Cash payment for the properties acquired			2,200,000
Mortgage notes issued for property acquired			$ 5,100,000
Residential Properties [Member] | Two Dubose Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Property	2		2	2
Proceeds from sale of property			$ 905,000	$ 815,000
Gain (loss) on sale of property			$ 74,000	$ (46,000)
Residential Properties [Member] | Rangewood Medical Office Building [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property		$ 2,200,000
Gain (loss) on sale of property		$ (170,000)
Residential Properties [Member] | Regatta Square Retail Center [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property	$ 3,000,000
Gain (loss) on sale of property	$ 756,000

X

- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464

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X

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
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X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

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- Definition

The cash outflow from the acquisition of residential property intended to generate income for the owner.

+ References

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- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

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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.

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No definition available.

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