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Mortgage and Other Notes Receivable - Summary (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Mar. 31, 2020
Mortgage And Other Notes Receivable [Line Items] |  |  |  |
Assignment of the partnership interest (as a percent) |  | 100.00% |  |
Mortgage and other notes receivable | $ 2,729,000 | $ 2,729,000 | $ 4,662,000 |
Mortgage Receivable |  |  |  |
Mortgage And Other Notes Receivable [Line Items] |  |  |  |
Interest Rate (as a percent) |  | 3.48% |  |
Mortgage and other notes receivable | 1,100,000 | $ 1,100,000 | $ 2,637,000 |
Mortgage Receivable | D'Iberville Promenade, LLC |  |  |  |
Mortgage And Other Notes Receivable [Line Items] |  |  |  |
Mortgage and other notes receivable |  |  |  | $ 1,100,000
Mortgage Receivable | Minimum |  |  |  |
Mortgage And Other Notes Receivable [Line Items] |  |  |  |
Interest Rate (as a percent) |  |  | 4.28% |
Mortgage Receivable | Maximum |  |  |  |
Mortgage And Other Notes Receivable [Line Items] |  |  |  |
Interest Rate (as a percent) |  |  | 9.50% |
Other Notes Receivable |  |  |  |
Mortgage And Other Notes Receivable [Line Items] |  |  |  |
Mortgage and other notes receivable | 1,629,000 | $ 1,629,000 | $ 2,025,000 |
Other Notes Receivable | The Shoppes At St Clair Square |  |  |  |
Mortgage And Other Notes Receivable [Line Items] |  |  |  |
Writing off for tenant receivables | $ 1,230,000 |  |  |
Other Notes Receivable | Minimum |  |  |  |
Mortgage And Other Notes Receivable [Line Items] |  |  |  |
Interest Rate (as a percent) |  | 4.00% | 4.00% |
Other Notes Receivable | Maximum |  |  |  |
Mortgage And Other Notes Receivable [Line Items] |  |  |  |
Interest Rate (as a percent) |  | 5.00% | 5.00% |

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- Definition Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column B)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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