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Recent Real Estate Transactions (Disposals of Properties) (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Feb. 28, 2017 USD ($) | Dec. 31, 2018 USD ($) Property | Dec. 31, 2017 USD ($) Property | Oct. 31, 2017 Property
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of properties | Property |  |  |  |  |  | 1
Disposed of real estate assets with net carrying value |  |  |  | $ 34,900,000 |  |
Gain on sale of real estate assets |  |  |  | 12,200,138 | $ 2,623,469 |
Residential Properties [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Proceeds from sale of property |  |  |  | 12,600,000 | 9,800,000 |
Gain (loss) on sale of property |  |  |  | $ 988,000 | $ 735,000 |
Number of properties | Property |  |  |  | 33 | 23 |
Residential Properties [Member] | Port of San Diego Complex [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Proceeds from sale of property |  |  |  | $ 24,800,000 |  |
Gain (loss) on sale of property |  |  |  | 10,000,000 |  |
Residential Properties [Member] | Yucca Valley Retail Center [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Proceeds from sale of property |  |  |  | 7,800,000 |  |
Gain (loss) on sale of property |  |  |  | 1,400,000 |  |
Residential Properties [Member] | Pacific Oaks Plaza [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Proceeds from sale of property |  |  |  | 3,900,000 |  |
Gain (loss) on sale of property |  |  |  | $ (232,000) |  |
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] | 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] | 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] | Forty-Five Dubose Model Homes [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of properties | Property |  |  |  | 45 |  |
Total purchase price of property acquired |  |  |  | $ 17,326,915 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(9)(a)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(7)(c)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(14)(d)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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