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SALES OF PROPERTIES AND PROPERTY HELD FOR SALE (Details) - USD ($)			3 Months Ended		6 Months Ended
	Jul. 01, 2021	Jun. 17, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Apr. 30, 2021	Dec. 31, 2020
Sale of Property
Repayment of mortgages payable					$ 18,832,000	$ 3,332,000
Prepayment costs on debt related to real estate			$ 799,000	$ 775,000	799,000	1,065,000
Property held-for-sale			6,446,000		6,446,000
Properties disposed of by sale | Retail property and parking lot, West Hartford, Connecticut
Sale of Property
Proceeds from sale of real estate, net of closing costs		$ 39,491,000
Gain on Sale of Real Estate, Net			21,491,000		21,491,000
Repayment of mortgages payable		15,403,000
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net		1,148,000
Write-off of the unamortized intangible lease liability		$ 967,000
Properties disposed of by sale | Retail property and parking lot, West Hartford, Connecticut | Prepayment costs on debt
Sale of Property
Prepayment costs on debt related to a swap termination fee			799,000		799,000
Properties disposed of by sale | Retail property, Onalaska, Wisconsin
Sale of Property
Proceeds from sale of real estate, net of closing costs						7,093,000
Gain on Sale of Real Estate, Net						4,252,000
Repayment of mortgages payable						3,332,000
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net						170,000
Properties disposed of by sale | Retail property, Onalaska, Wisconsin | Prepayment costs on debt
Sale of Property
Prepayment costs on debt related to real estate						$ 290,000
Properties disposed of by sale | Retail property located in Philadelphia, Pennsylvania
Sale of Property
Gain on Sale of Real Estate, Net	$ 1,299,000
Non-controlling interest's share of the gain	130,000
Repayment of mortgages payable	$ 3,574,000
Properties held-for-sale | Retail property located in Philadelphia, Pennsylvania
Sale of Property
Contracted gross sales price							$ 8,300,000
Property held-for-sale			6,446,000		6,446,000
Consolidated Joint Venture-VIEs
Sale of Property
Property held-for-sale			$ 6,446,000		$ 6,446,000			$ 0
Consolidated Joint Venture-VIEs | Properties held-for-sale | Retail property located in Philadelphia, Pennsylvania
Sale of Property
Ownership interest in consolidated joint venture of the company (as a percent)							90.00%

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