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Schedule III (Real Estate and Accumulated Depreciation and Amortization) (Parenthetical) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 15, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Real estate asset sold |  | $ 40,023,572 | $ 23,464,380
Building and Building Improvements [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Estimated useful life |  | 39 years |
Morena Office Center [Member] | Subsequent Event [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Real estate asset sold | $ 5,600,000 |  |

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- Definition 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. + References No definition available. + Details
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- Definition Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column I)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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