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Recent Real Estate Transactions (Disposals of Properties) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Property | Dec. 31, 2016 USD ($) | Oct. 31, 2017 Property
Real Estate Properties [Line Items] |  |  |
Number of properties | Property |  |  | 2
Disposed of real estate assets with net carrying value | $ 17,978,957 |  |
Gain on sale of real estate assets | $ 2,623,469 | $ 2,186,481 |
Residential Properties [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Total purchase price of property acquired |  | 17,560,745 |
Residential Properties [Member] | Forty-Seven Dubose Model Homes [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of properties | Property | 47 |  |
Total purchase price of property acquired | $ 17,600,000 | $ 17,560,745 |

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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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