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SALES OF PROPERTIES (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Jan. 19, 2024 | Dec. 21, 2023 | Dec. 15, 2023 | Dec. 07, 2023 | Dec. 05, 2023 | Nov. 17, 2023 | Nov. 15, 2023 | Nov. 14, 2023 | Sep. 20, 2023 | May 31, 2023 | Feb. 28, 2023 | Aug. 08, 2022 | Jun. 17, 2022 | May 02, 2022 | Mar. 22, 2022 | Dec. 27, 2021 | Jul. 01, 2021 | Jun. 17, 2021 | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment costs on debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 901,000
Reduction to Gain on sale of real estate, net, attributable to the write-off of unbilled rent receivable. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,048,000 | $ 519,000 | 1,438,000
Gain on sale of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,008,000 | 16,762,000 | 25,463,000
Applebees restaurant property, Lawrenceville, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller-financing provided by the Company |  |  |  | $ 1,816,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,816,000 |  |
Loan receivable interest rate |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan receivable, option to extend, term |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,186,000 | 31,600,000 | 54,510,000
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,008,000 | 16,762,000 | 25,463,000
Mortgage Prepaid on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,387,000
Prepayment costs on debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 848,000
Reduction to Gain on sale of real estate, net, attributable to the write-off of unbilled rent receivable. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,005,000 | 519,000 | 1,438,000
Reduction to Gain on sale of real estate, net, attributable to the write-off of net unamortized lease liabilities and assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 982,000 | $ 4,000 |
Reduction to Gain on sale of real estate, net, attributable to the write-off of net unamortized lease assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 967,000
Reduction to Gain on sale of real estate, net, attributable to the write-off of other assets and receivables. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 223,000 |  |
Properties disposed of by sale | TGI Fridays Restaurant, Hauppauge, New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  | $ 1,534,000 |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Haverty's retail property, Duluth, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  | $ 3,180,000 |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | TGI Fridays Restaurant, Greensboro, North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  | $ 3,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  |  | $ 332,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Land, Lakewood, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | $ 3,333,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  | $ 2,177,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Chuck E Cheese restaurant property, Indianapolis, Indiana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  | $ 226,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | TGI Fridays restaurant property, Richmond, Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  | $ 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  | $ 265,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Applebees restaurants - 2 properties, Cartersville & Carrolton, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | $ 7,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  | $ 2,581,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Applebees restaurant property, Lawrenceville, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  | $ 2,903,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  | $ 989,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Havertys retail property, Virginia Beach, Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  | $ 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  | $ 1,727,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Barnes & Noble retail property, Fort Myers, Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  | $ 7,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  | $ 3,997,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Wendy's restaurants - 4 properties, Various Cities, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,510,000 |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,469,000 |  |  |  |
Properties disposed of by sale | Vacant retail property, Philadelphia, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,300,000 |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,299,000 |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |
Non-controlling interest's share of the gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 130,000 |  |  |  |  |
Properties disposed of by sale | Wendy's restaurants - 2 properties, Hanover & Gettysburg, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,700,000 |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,695,000 |  |  |  |  |  |
Properties held-for-sale | Pad site at a multi-tenant shopping center in Lakewood, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracted sale price of property | $ 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Joint Venture-VIEs | Properties disposed of by sale | Land, Lakewood, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE 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 |  |  |  |  |  |  |  | $ 218,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Prepaid on Sale |  |  |  |  |  |  |  | $ 1,116,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Joint Venture-VIEs | Properties held-for-sale | Pad site at a multi-tenant shopping center in Lakewood, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Joint Venture-VIEs | Properties held-for-sale | Pad site at a multi-tenant shopping center in Lakewood, Colorado | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES & PROPERTIE HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest's share of the gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 180,000 |  |  |
Gain on sale of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  |

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