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SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE (Details)												12 Months Ended
	Dec. 27, 2021 USD ($)	Jul. 01, 2021 USD ($)	Jun. 17, 2021 USD ($)	Dec. 15, 2020 USD ($)	Jul. 01, 2020 USD ($)	Feb. 11, 2020 USD ($)	Dec. 10, 2019 USD ($)	Oct. 21, 2019 USD ($)	Aug. 29, 2019 USD ($)	Aug. 23, 2019 USD ($)	Jun. 20, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 31, 2022 USD ($) property	Sep. 30, 2021 USD ($)
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Prepayment costs on debt related to real estate												$ 901,000	$ 1,123,000	$ 827,000
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net												1,438,000	365,000	182,000
Property held-for-sale												1,270,000
Gain on sale of real estate, net												25,463,000	17,280,000	4,327,000
Pet Smart and Guitar Center retail properties, Houston, Texas | Other receivables
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Seller-financing provided by the Company													4,613,000
Properties disposed of by sale
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price												54,510,000	34,340,000	41,891,000
Gain (Loss) on Sale of Real Estate, Net												25,463,000	17,280,000	4,327,000
Mortgage Prepaid on Sale												20,387,000	11,815,000	17,507,000
Prepayment costs on debt related to real estate												848,000	1,123,000	827,000
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net												1,438,000	365,000	182,000
Write-off of unamortized lease assets, as a reduction to Gain on sale of real estate, net												967,000	$ 367,000	$ 915,000
Properties disposed of by sale | Whole Foods retail property & parking lot, West Hartford, Connecticut
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price			$ 40,510,000
Gain (Loss) on Sale of Real Estate, Net			21,469,000
Mortgage Prepaid on Sale			15,403,000
Prepayment costs on debt related to real estate			$ 799,000
Properties disposed of by sale | Vacant retail property, Philadelphia, Pennsylvania
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price		$ 8,300,000
Gain (Loss) on Sale of Real Estate, Net		1,299,000
Mortgage Prepaid on Sale		3,574,000
Prepayment costs on debt related to real estate		$ 26,000
Properties disposed of by sale | Wendys restaurant property, Hanover, Pennsylvania
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price	$ 2,815,000
Gain (Loss) on Sale of Real Estate, Net	1,331,000
Mortgage Prepaid on Sale	696,000
Prepayment costs on debt related to real estate	11,000
Properties disposed of by sale | Wendys restaurant property, Gettysburg, Pennsylvania
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price	2,885,000
Gain (Loss) on Sale of Real Estate, Net	1,364,000
Mortgage Prepaid on Sale	714,000
Prepayment costs on debt related to real estate	$ 12,000
Properties disposed of by sale | Hobby Lobby retail property, Onalaska, Wisconsin
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price						$ 7,115,000
Gain (Loss) on Sale of Real Estate, Net						4,252,000
Mortgage Prepaid on Sale						3,332,000
Prepayment costs on debt related to real estate						$ 290,000
Properties disposed of by sale | CarMax retail property, Knoxville, Tennessee
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price					$ 18,000,000
Gain (Loss) on Sale of Real Estate, Net					10,316,000
Mortgage Prepaid on Sale					8,483,000
Prepayment costs on debt related to real estate					$ 833,000
Properties disposed of by sale | Pet Smart retail property, Houston, Texas
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price				$ 4,013,000
Gain (Loss) on Sale of Real Estate, Net				1,067,000
Properties disposed of by sale | Guitar Center retail property, Houston, Texas
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price				5,212,000
Gain (Loss) on Sale of Real Estate, Net				$ 1,645,000
Properties disposed of by sale | Kmart retail property, Clemmons, North Carolina
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price											$ 5,500,000
Gain (Loss) on Sale of Real Estate, Net											1,099,000
Mortgage Prepaid on Sale											1,705,000
Prepayment costs on debt related to real estate											$ 41,000
Properties disposed of by sale | Multi-tenant retail property, Athens, Georgia
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price										$ 6,050,000
Gain (Loss) on Sale of Real Estate, Net										1,045,000
Mortgage Prepaid on Sale										2,645,000
Prepayment costs on debt related to real estate										$ 161,000
Properties disposed of by sale | Land - The Briarbrook Village Apartments, Wheaton, Illinois
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price									$ 12,066,000
Gain (Loss) on Sale of Real Estate, Net									$ 1,530,000
Properties disposed of by sale | Aaron's retail property, Houston, Texas
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price								$ 1,675,000
Gain (Loss) on Sale of Real Estate, Net								$ 218,000
Properties disposed of by sale | Assisted living facility, Round Rock, Texas
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Gross Sales Price							$ 16,600,000
Gain (Loss) on Sale of Real Estate, Net							435,000
Mortgage Prepaid on Sale							13,157,000
Prepayment costs on debt related to real estate							$ 625,000
Properties held-for-sale | Industrial property located in Columbus, Ohio
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Contracted sale price of property																$ 8,500,000
Property held-for-sale												$ 1,270,000
Properties held-for-sale | Four restaurant properties located in Pennsylvania
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Number of properties held-for-sale | property															4
Contracted sale price of property															$ 10,000,000
Consolidated Joint Venture-VIEs | Properties disposed of by sale | Vacant retail property, Philadelphia, Pennsylvania
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Ownership interest in consolidated joint venture of the company (as a percent)		90.00%
Non-controlling interest's share of the gain		$ 130,000
Consolidated Joint Venture-VIEs | Properties disposed of by sale | Kmart retail property, Clemmons, North Carolina
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE
Ownership interest in consolidated joint venture of the company (as a percent)											90.00%
Non-controlling interest's share of the gain											$ 422,000

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