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v3.26.1

LEASES - As Lessee - Ground Lease and Office Lease (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 USD ($) item | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) item | Jun. 30, 2025 USD ($)
Ground Lease |  |  |  |
Lessee Accounting |  |  |  |
Operating lease, option to extend |  |  | true |
Operating lease, remaining lease term | 3 years 8 months 12 days |  | 3 years 8 months 12 days |
Ground Lease | Location, Statement of Income, Balance [Axis]: olp:RealEstateOperatingExpenses |  |  |  |
Lessee Accounting |  |  |  |
Operating lease expense | $ | $ 122,000 | $ 122,000 | $ 244,000 | $ 244,000
Ground Lease | Five-Year Lease |  |  |  |
Lessee Accounting |  |  |  |
Operating lease, number of renewal options | item | 3 |  | 3 |
Operating lease, renewal term | 5 years |  | 5 years |
Ground Lease | Seven-Month Lease |  |  |  |
Lessee Accounting |  |  |  |
Operating lease, number of renewal options | item | 1 |  | 1 |
Operating lease, renewal term | 7 months |  | 7 months |
Office Lease |  |  |  |
Lessee Accounting |  |  |  |
Operating lease, option to extend |  |  | true |
Operating lease, remaining lease term | 10 years 6 months |  | 10 years 6 months |
Office Lease | Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense |  |  |  |
Lessee Accounting |  |  |  |
Operating lease expense | $ | $ 14,000 | $ 14,000 | $ 28,000 | $ 28,000
Office Lease | Five-Year Lease |  |  |  |
Lessee Accounting |  |  |  |
Operating lease, renewal term | 5 years |  | 5 years |

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- Definition The number of renewal options available to the Company, as defined in the lease agreement. + References No definition available. + Details
Name: | olp_LesseeOperatingLeasesNumberOfRenewalOptions
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_LesseeOperatingLeaseExistenceOfOptionToExtend
Namespace Prefix: | us-gaap_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration

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- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
Name: | us-gaap_LesseeOperatingLeaseRemainingLeaseTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-4 + Details
Name: | us-gaap_OperatingLeaseExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=olp_GreensboroNCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementOfIncomeLocationBalanceAxis=olp_RealEstateOperatingExpenses
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LeaseContractualTermAxis=olp_FiveYearLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LeaseContractualTermAxis=olp_SevenMonthLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=olp_CorporateOfficeLeaseInGreatNeckMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementOfIncomeLocationBalanceAxis=us-gaap_GeneralAndAdministrativeExpense
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |