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SALE OF PROPERTIES AND PROPERTY HELD-FOR-SALE (Details) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
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Jun. 17, 2022 | May 02, 2022 | Mar. 22, 2022 | Jun. 17, 2021 | Sep. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2022 | Feb. 28, 2022 | Dec. 31, 2021
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |
Prepayment costs on debt |  |  |  |  |  | $ 799,000 |  | $ 799,000 |  |  |
Properties held-for-sale |  |  |  |  |  |  | $ 3,766,000 |  |  |  | $ 1,270,000
Properties disposed of by sale |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  | 23,300,000 | 40,510,000 |  |  |
Gain on sale of real estate, net |  |  |  |  |  |  | 12,699,000 | $ 21,491,000 |  |  |
Properties disposed of by sale | Four restaurant properties located in Pennsylvania |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net |  |  | $ 512,000 |  |  |  |  |  |  |  |
Properties disposed of by sale | Wendy's restaurant property, Palmyra, Pennsylvania |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  | 2,555,000 |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  | 1,200,000 |  |  |  |  |  |  |  |
Properties disposed of by sale | Wendy's restaurant property 1, Reading, Pennsylvania |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  | 2,525,000 |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  | 1,184,000 |  |  |  |  |  |  |  |
Properties disposed of by sale | Wendy's Restaurant Property 2, Reading, Pennsylvania |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  | 2,485,000 |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  | 1,175,000 |  |  |  |  |  |  |  |
Properties disposed of by sale | Wendy's Restaurant Property, Trexlertown, Pennsylvania |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  | 2,435,000 |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  | $ 1,090,000 |  |  |  |  |  |  |  |
Properties disposed of by sale | Orlando Baking industrial property, Columbus, Ohio |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES AND PROPERTY 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 AND PROPERTY 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 |  |  |  |  |  |  |  |  |  |
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net | 7,000 |  |  |  |  |  |  |  |  |  |
Write-off of unamortized lease assets, as a reduction to Gain on sale of real estate, net | 1,000 |  |  |  |  |  |  |  |  |  |
Write-off of unamortized lease liabilities, as a reduction to Gain on sale of real estate, net | $ 5,000 |  |  |  |  |  |  |  |  |  |
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 on sale of real estate, net |  |  |  | 21,491,000 |  |  |  |  |  |  |
Mortgage Prepaid on Sale |  |  |  | 15,403,000 |  |  |  |  |  |  |
Prepayment costs on debt |  |  |  | 799,000 |  |  |  |  |  |  |
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net |  |  |  | 1,148,000 |  |  |  |  |  |  |
Write-off of unamortized lease assets, as a reduction to Gain on sale of real estate, net |  |  |  | $ 967,000 |  |  |  |  |  |  |
Properties disposed of by sale | Retail property located in Columbus, Ohio | Forecast |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  |  |  | $ 4,000,000 |  |  |  | $ 4,000,000 |  |
Properties held-for-sale | Retail property located in Columbus, Ohio |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |
Contracted sale price of property |  |  |  |  |  |  |  |  |  | $ 8,300,000 |
Properties held-for-sale | Retail property located in Columbus, Ohio | Land, building and improvements |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE |  |  |  |  |  |  |  |  |  |  |
Properties held-for-sale |  |  |  |  |  |  | $ 3,766,000 |  |  |  |

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