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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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Amount of decrease in 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, from collection of principal.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 6
-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
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Amount of federal income tax basis of 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.

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-Publisher SEC
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Amount of principal due on delinquent 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.

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