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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

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- References

No definition available.

+ Details

Name:	us-gaap_RestrictedCashAndInvestmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration