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SIGNIFICANT ACCOUNTING POLICIES - Escrows (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Escrows |  |
Real estate taxes, insurance and other escrows | $ 502,000 | $ 859,000

X
- Definition Represents the amounts for real estate taxes, insurance and other escrows related to real estate in escrow, deposits and other assets and receivables. + References No definition available. + Details
Name: | olp_RealEstateTaxesInsuranceAndOtherEscrows
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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