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SALES OF PROPERTIES (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Aug. 08, 2022 | Jun. 17, 2022 | May 02, 2022 | Mar. 22, 2022 | Dec. 27, 2021 | Jul. 01, 2021 | Jun. 17, 2021 | Dec. 15, 2020 | Jul. 01, 2020 | Feb. 11, 2020 | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment costs on debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 901,000 | $ 1,123,000
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net |  |  |  |  |  |  |  |  |  |  |  | $ 519,000 | 1,438,000 | 365,000
Pet Smart and Guitar Center retail properties, Houston, Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller-financing provided by the Company |  |  |  |  |  |  |  | $ 4,613,000 |  |  |  |  |  |
Properties disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  | 31,600,000 | 54,510,000 | 34,340,000
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  |  | 16,762,000 | 25,463,000 | 17,280,000
Mortgage Prepaid on Sale |  |  |  |  |  |  |  |  |  |  |  | 1,563,000 | 20,387,000 | 11,815,000
Prepayment costs on debt |  |  |  |  |  |  |  |  |  |  |  |  | 848,000 | 1,123,000
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net |  |  |  |  |  |  |  |  |  |  |  | 519,000 | 1,438,000 | 365,000
Write-off of net unamortized lease liabilities and assets, as a reduction to Gain on sale of real estate, net |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  |
Write-off of unamortized lease assets, as a reduction to Gain on sale of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  | $ 967,000 |
Write-off of the unamortized intangible lease liability |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 367,000
Properties disposed of by sale | Wendy's restaurants - 4 properties, Various Cities, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  | $ 4,649,000 |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Orlando Baking industrial property, Columbus, Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  | $ 8,500,000 |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  | $ 6,925,000 |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Haverty's retail property, Fayetteville, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  | $ 4,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  | 1,125,000 |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Prepaid on Sale |  | $ 1,563,000 |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Vacant Retail Property, Columbus, Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price | $ 8,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net | $ 4,063,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Whole Foods retail property & parking lot, West Hartford, Connecticut |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  | $ 40,510,000 |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  | 21,469,000 |  |  |  |  |  |  |
Mortgage Prepaid on Sale |  |  |  |  |  |  | 15,403,000 |  |  |  |  |  |  |
Prepayment costs on debt |  |  |  |  |  |  | $ 799,000 |  |  |  |  |  |  |
Properties disposed of by sale | Vacant retail property, Philadelphia, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  | $ 8,300,000 |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  | 1,299,000 |  |  |  |  |  |  |  |
Mortgage Prepaid on Sale |  |  |  |  |  | 3,574,000 |  |  |  |  |  |  |  |
Prepayment costs on debt |  |  |  |  |  | 26,000 |  |  |  |  |  |  |  |
Properties disposed of by sale | Wendys restaurant property, Hanover, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | $ 2,815,000 |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  | 1,331,000 |  |  |  |  |  |  |  |  |
Mortgage Prepaid on Sale |  |  |  |  | 696,000 |  |  |  |  |  |  |  |  |
Prepayment costs on debt |  |  |  |  | 11,000 |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Wendys restaurant property, Gettysburg, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | 2,885,000 |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  | 1,364,000 |  |  |  |  |  |  |  |  |
Mortgage Prepaid on Sale |  |  |  |  | 714,000 |  |  |  |  |  |  |  |  |
Prepayment costs on debt |  |  |  |  | $ 12,000 |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Hobby Lobby retail property, Onalaska, Wisconsin |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  | $ 7,115,000 |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  | 4,252,000 |  |  |  |
Mortgage Prepaid on Sale |  |  |  |  |  |  |  |  |  | 3,332,000 |  |  |  |
Prepayment costs on debt |  |  |  |  |  |  |  |  |  | $ 290,000 |  |  |  |
Properties disposed of by sale | CarMax retail property, Knoxville, Tennessee |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  | $ 18,000,000 |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  |  | 10,316,000 |  |  |  |  |
Mortgage Prepaid on Sale |  |  |  |  |  |  |  |  | 8,483,000 |  |  |  |  |
Prepayment costs on debt |  |  |  |  |  |  |  |  | $ 833,000 |  |  |  |  |
Properties disposed of by sale | Pet Smart retail property, Houston, Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | 4,013,000 |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  | 1,067,000 |  |  |  |  |  |
Properties disposed of by sale | Guitar Center retail property, Houston, Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | 5,212,000 |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  | $ 1,645,000 |  |  |  |  |  |
Properties disposed of by sale | Real Estate in Hauppauge, NY | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |
Properties held-for-sale | Real Estate in Hauppauge, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracted sale price of property |  |  |  |  |  |  |  |  |  |  |  | $ 4,200,000 |  |
Consolidated Joint Venture-VIEs | Properties disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest's share of the gain |  |  |  |  |  | $ 130,000 |  |  |  |  |  |  |  |
Consolidated Joint Venture-VIEs | Properties disposed of by sale | Vacant retail property, Philadelphia, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |

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