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SALES OF PROPERTIES AND IMPAIRMENT LOSS (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
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Sep. 16, 2024 | Aug. 29, 2024 | Aug. 15, 2024 | Jun. 28, 2024 | Jun. 10, 2024 | Jun. 07, 2024 | Jun. 06, 2024 | May 09, 2024 | May 06, 2024 | Mar. 06, 2024 | Sep. 20, 2023 | May 31, 2023 | Feb. 28, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,115,000 | $ 332,000 | $ 11,347,000 | $ 5,046,000
Impairment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,086,000 |
Properties disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,445,000 | 13,450,000
Gain on sale of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,347,000 | 5,046,000
Mortgage prepaid on sale of real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,714,000 |
Reduction to Gain on sale of real estate, net, attributable to the write-off of unbilled rent receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 285,000 | 123,000
Reduction to Gain on sale of real estate, net, attributable to the write-off of net unamortized lease liabilities and assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,000 |
Reduction to Gain on sale of real estate, net, attributable to the write-off of other assets and receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108,000 | $ 190,000
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Vacant health and fitness property in Hamilton, Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  | $ 4,350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  | $ 17,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,086,000 |
Properties disposed of by sale | Vacant industrial property in Wauconda, IL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  | $ 4,425,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  | $ 1,177,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | Hobby Lobby retail property in Woodbury, Minnesota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price | $ 4,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net | $ 921,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties disposed of by sale | TGI Fridays restaurant property in 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 | Havertys retail property in 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 | TGI Fridays restaurant property in Greensboro, North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  | $ 3,250,000 |  |  |  |  |  |
Gain on sale of real estate, net |  |  |  |  |  |  |  |  |  |  | $ 332,000 |  |  |  |  |  |
Consolidated Joint Venture-VIEs | Properties disposed of by sale | Hacienda Colorado restaurant parcel in Lakewood, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest's share of the gain |  |  |  |  | $ 105,000 |  |  |  |  |  |  |  |  |  |  |  |
Consolidated VIE 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |
Consolidated VIE 1 | 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% |  |  |  |  |  |  |
Consolidated VIE 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00% |
Consolidated VIE 2 | 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% |  |  |  |  |  |  |  |  |  |  |  |

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