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OTHER INCOME - Lease Assignment Fee Income (Details) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) item | Sep. 30, 2021 USD ($)
Lease Assignment Fee Income |  |
Fee income, lease assignment agreement | $ 100,000 |
Number of properties included in a lease split and assignment agreement | item | 6 |
Other income |  |
Lease Assignment Fee Income |  |
Fee income, lease assignment agreement |  | $ 100,000

X
- Definition The amount of one-time income from tenant agreement to lease split and assignment. + References No definition available. + Details
Name: | olp_FeeIncomeLeaseSplitAndAssignmentAgreement
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The number of properties included in a lease split and assignment agreement. + References No definition available. + Details
Name: | olp_NumberOfPropertiesIncludedInLeaseSplitAndAssignmentAgreement
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=olp_OtherNonoperatingIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |