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LEASES - As Lessor - Lease Incentives (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Lease Incentives |  |
Unamortized lease incentives | $ 1,095,000 | $ 1,300,000
Lease incentives amortized | 121,000 | $ 44,000
Write-off of unamortized lease incentives | $ 84,000 |
Amortization term of lease incentives | 10 years |

X
- Definition The term over which loan incentives are amortized, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | olp_LeaseIncentiveAmortizationTerm
Namespace Prefix: | olp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | olp_LeaseIncentivesAbstract
Namespace Prefix: | olp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of amortization of lease incentive costs incurred by the lessor for the benefit of the lessee. + References No definition available. + Details
Name: | olp_LeaseIncentivesAmortized
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of unamortized lease incentives written off due to the sale of the related property. + References No definition available. + Details
Name: | olp_LeaseIncentivesWriteOffOfUnamortizedLeaseIncentiveDueToSaleOfProperty
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of unamortized lease incentives.. + References No definition available. + Details
Name: | olp_OtherAssetsAndReceivablesUnamortizedLeaseIncentives
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant