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Schedule IV - MORTGAGE NOTES RECEIVABLE ON REAL ESTATE (Details) - USD ($) | 2 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Monthly payment amount |  | $ 10,000 |  |
Balloon Payment At Maturity |  | 2,637,000 |  |
Face Amount Of Mortgage |  | 2,821,000 |  |
Carrying Amount of Mortgage |  | 2,637,000 |  |
Principal Amount Of Mortgage Subject To Delinquent Principal Or Interest |  | 1,100,000 |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |
Beginning balance |  | 4,884,000 | $ 5,418,000 | $ 5,680,000
Additions | $ 102,446,000 |  |  | 1,802,000
Payments |  | (2,247,000) | (534,000) | (2,064,000)
Ending balance |  | $ 2,637,000 | $ 4,884,000 | $ 5,418,000
Prime Rate |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) |  | 2.00% |  |
Columbia Place Outparcel | First Mortgage |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Interest rate (as a percent) |  | 5.00% |  |
Monthly payment amount |  | $ 3,000 |  |
Balloon Payment At Maturity |  | 262,000 |  |
Face Amount Of Mortgage |  | 360,000 |  |
Carrying Amount of Mortgage |  | $ 262,000 |  |
D'Iberville Promenade LLC | First Mortgage |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Interest rate (as a percent) |  | 4.28% |  |
Balloon Payment At Maturity |  | $ 1,100,000 |  |
Face Amount Of Mortgage |  | 1,100,000 |  |
Carrying Amount of Mortgage |  | 1,100,000 |  |
Principal Amount Of Mortgage Subject To Delinquent Principal Or Interest |  | $ 1,100,000 |  |
The Shoppes at St Clair Square | First Mortgage |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Interest rate (as a percent) |  | 6.75% |  |
Monthly payment amount |  | $ 7,000 |  |
Balloon Payment At Maturity |  | 1,230,000 |  |
Face Amount Of Mortgage |  | 1,316,000 |  |
Carrying Amount of Mortgage |  | $ 1,230,000 |  |
Soddy Daisy | First Mortgage |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Interest rate (as a percent) |  | 9.50% |  |
Balloon Payment At Maturity |  | $ 45,000 |  |
Face Amount Of Mortgage |  | 45,000 |  |
Carrying Amount of Mortgage |  | $ 45,000 |  |
New Garden Crossing | First Mortgage | LIBOR |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) |  | 2.50% |  |

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- Definition The percentage points added to the reference rate or index during the adjustment period to compute the variable [fully indexed] rate on the loans receivable realized during the reporting period. This may be an effective margin for the period depending on the specific terms of the underlying loan agreement (for example, an annual disclosure for a loan with a quarterly adjustment period). + References No definition available. + Details
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