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RELATED PARTY TRANSACTIONS - Other (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Mar. 31, 2026 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Gould Investors L.P. | Location, Statement of Income, Balance [Axis]: olp:RealEstateOperatingExpenses |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Insurance expense recognized of amounts reimbursed to related party | $ 508,000 |  | $ 187,000 |  | $ 1,282,000 | $ 463,000
Chairman | Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Quarterly fees paid | 88,000 | $ 88,000 | 85,000 | $ 85,000 |  |
Vice Chairman | Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Quarterly fees paid | $ 34,000 | $ 34,000 | $ 34,000 | $ 34,000 |  |
Affiliated Entity | Gould Investors L.P. |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Amount of insurance reimbursed |  |  |  |  | $ 105,000 |

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