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Recent Real Estate Transactions (Disposals of Properties) (Details) |  |  |  |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 28, 2015 USD ($) | Aug. 26, 2015 USD ($) | Aug. 13, 2015 USD ($) | Aug. 08, 2015 USD ($) Property | Apr. 24, 2015 USD ($) | Apr. 10, 2015 USD ($) | Sep. 30, 2015 USD ($) Property | Dec. 31, 2014 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Mortgage notes payable |  |  |  |  |  |  | $ 128,208,218 | $ 106,966,774
West Fargo Industrial [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Mortgage notes payable |  |  |  |  |  |  | 4,500,000 |
Highland Court [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Mortgage notes payable |  |  |  |  |  |  | 6,989,587 |
Sparkys Self-Storage Portfolio, Disposal Group [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Business acquisition contributed revenue |  |  |  |  |  |  | 567,000 |
Business acquisition operating expenses |  |  |  |  |  |  | 138,000 |
Proceeds from sale of property |  |  |  |  |  | $ 34,000,000 |  |
Mortgage notes payable retired |  |  |  |  |  | 16,900,000 |  |
Gain (loss) on sale of property |  |  |  |  |  | $ 4,700,000 |  |
Yucca Valley Retail Center [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Mortgage notes payable |  |  |  |  |  |  | $ 6,000,000 | $ 2,982,411
Proceeds from sale of property |  |  |  |  | $ 1,500,000 |  |  |
Gain (loss) on sale of property |  |  |  |  | $ 1,100,000 |  |  |
Residential Properties [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Number of properties | Property |  |  |  |  |  |  | 62 |
Residential Properties [Member] | West Fargo Industrial [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Number of properties | Property |  |  |  | 7 |  |  |  |
Purchase price of property acquired |  |  |  | $ 7,900,000 |  |  |  |
Cash payment for the properties acquired |  |  |  | 3,400,000 |  |  |  |
Mortgage notes payable |  |  |  | 4,500,000 |  |  |  |
Residential Properties [Member] | 300 N.P. [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Cash payment for the properties acquired |  |  |  | $ 3,800,000 |  |  |  |
Residential Properties [Member] | Research Parkway [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Cash payment for the properties acquired |  |  | $ 2,800,000 |  |  |  |  |
Residential Properties [Member] | Highland Court [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Purchase price of property acquired |  | $ 13,000,000 |  |  |  |  |  |
Cash payment for the properties acquired |  | 6,000,000 |  |  |  |  |  |
Mortgage notes payable |  | $ 7,000,000 |  |  |  |  |  |
Residential Properties [Member] | One Parke Center [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Purchase price of property acquired | $ 9,100,000 |  |  |  |  |  |  |
Cash payment for the properties acquired | 2,600,000 |  |  |  |  |  |  |
Mortgage notes payable | $ 6,600,000 |  |  |  |  |  |  |
Residential Properties [Member] | Seventeen Dubos Model Homes [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Number of properties | Property |  |  |  |  |  |  | 17 |
Purchase price of property acquired |  |  |  |  |  |  | $ 5,700,000 |
Cash payment for the properties acquired |  |  |  |  |  |  | 2,300,000 |
Mortgage notes payable |  |  |  |  |  |  | $ 3,400,000 |
Residential Properties [Member] | Four Dubos Model Homes [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Number of properties | Property |  |  |  |  |  |  | 5 |
Proceeds from sale of property |  |  |  |  |  |  | $ 1,500,000 |
Mortgage notes payable retired |  |  |  |  |  |  | 702,000 |
Gain (loss) on sale of property |  |  |  |  |  |  | $ 156,000 |

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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=35744172&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=56956791&loc=d3e4845-128472 + Details
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- 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=56944662&loc=d3e3602-108585 + Details
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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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities. + References No definition available. + Details
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