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SALES OF PROPERTIES AND IMPAIRMENT LOSS (Details) - USD ($) |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
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Jun. 28, 2024 | Jun. 10, 2024 | Jun. 07, 2024 | Jun. 06, 2024 | May 09, 2024 | May 06, 2024 | Mar. 06, 2024 | May 31, 2023 | Feb. 28, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jul. 11, 2024 | Jul. 01, 2024
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  |  |  |  |  |  |  |  | $ 7,448,000 | $ 3,180,000 | $ 9,232,000 | $ 4,714,000 |  |
Impairment loss |  |  |  |  |  |  |  |  |  | 1,086,000 |  | 1,086,000 |  |  |
Properties disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  | 25,920,000 | 10,200,000 |  |
Gain on sale of real estate, net |  |  |  |  |  |  |  |  |  |  |  | 9,232,000 | 4,714,000 |  |
Reduction to Gain on sale of real estate, net, attributable to the write-off of unbilled rent receivable |  |  |  |  |  |  |  |  |  |  |  | 275,000 |  |  |
Reduction to Gain on sale of real estate, net, attributable to the write-off of net unamortized lease liabilities and assets |  |  |  |  |  |  |  |  |  |  |  | 439,000 |  |  |
Reduction to Gain on sale of real estate, net, attributable to the write-off of other assets and receivables |  |  |  |  |  |  |  |  |  |  |  | 108,000 | 190,000 |  |
Reduction to Gain on sale of real estate, net, attributable to the write-off of unearned rental income |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,000 |  |
Properties disposed of by sale | Hacienda Colorado Restaurant Parcel in Lakewood, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  | $ 2,900,000 |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  |  |  |  |  | $ 1,784,000 |  |  |  |  |  |  |  |
Properties disposed of by sale | Applebee's Restaurant Property in Kennesaw, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  | $ 2,834,000 |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  |  |  |  | $ 964,000 |  |  |  |  |  |  |  |  |
Properties disposed of by sale | FedEx Industrial Property in Miamisburg, Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | $ 2,793,000 |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  |  |  | $ 1,507,000 |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Havertys retail property in Wichita, Kansas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  | $ 6,600,000 |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  |  | $ 1,884,000 |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Urban Outfitters retail property in Lawrence, Kansas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  | $ 43,000 |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Walgreens retail property in Cape Girardeau, Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  | $ 2,793,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  | $ 978,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Vacant retail property in Kennesaw, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price | $ 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net | 2,072,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage prepaid on sale of real estate | $ 4,412,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | TGI Fridays Restaurant, Hauppauge, New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  |  |  |  |  |  | $ 3,180,000 |  |  |  |  |  |  |
Properties disposed of by sale | Vacant industrial property in Wauconda, IL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracted sale price of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,500,000
Properties held-for-sale | Health and fitness property in Real Estate in Hamilton, OH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracted sale price of property |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,350,000 |
Impairment loss |  |  |  |  |  |  |  |  |  | 1,086,000 |  | 1,086,000 |  |  |
Adjusted net book value |  |  |  |  |  |  |  |  |  | $ 4,161,000 |  | $ 4,161,000 |  |  |
Consolidated Joint Venture-VIEs | Properties disposed of by sale | Hacienda Colorado Restaurant Parcel in Lakewood, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |
Mortgage prepaid on sale of real estate |  |  |  |  |  |  | $ 1,885,000 |  |  |  |  |  |  |  |
Non-controlling interest's share of the gain |  |  |  |  |  |  | $ 178,000 |  |  |  |  |  |  |  |
Consolidated Joint Venture-VIEs | Properties disposed of by sale | Walgreens retail property in Cape Girardeau, Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest's share of the gain |  | $ 105,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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