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Recent Real Estate Transactions (Disposals of Properties) (Details)				6 Months Ended
	Apr. 07, 2017 USD ($)	Mar. 31, 2017 USD ($)	Feb. 27, 2017 USD ($)	Jun. 30, 2018 USD ($) Property	Jun. 30, 2017 USD ($) Property	Dec. 31, 2017 USD ($)
Real Estate Properties [Line Items]
Mortgage notes issued for property acquired				$ 170,624,849		$ 160,322,737
Residential Properties [Member] | Twenty-Six Dubose Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Property				26
Purchase price of property acquired				$ 10,200,000
Cash payment for the properties acquired				3,100,000
Mortgage notes issued for property acquired				$ 7,100,000
Residential Properties [Member] | Thirteen Dubose Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Property				13
Proceeds from sale of property				$ 4,600,000
Gain (loss) on sale of property				$ 429,000
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
Residential Properties [Member] | Shoreline Medical Building [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property	$ 8,200,000
Gain (loss) on sale of property	$ 1,300,000
Residential Properties [Member] | Nine Dubose Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Property					9
Proceeds from sale of property					$ 2,500,000
Gain (loss) on sale of property					$ 141,000
Residential Properties [Member] | Thirty Dubose Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Property					30
Purchase price of property acquired					$ 9,700,000
Cash payment for the properties acquired					2,900,000
Mortgage notes issued for property acquired					$ 6,800,000

X

- Definition

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

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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.

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

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