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RELATED PARTY TRANSACTIONS - Compensation and Services Agreement (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Majestic
Related Party Transactions
Aggregate fees under compensation and services agreement	$ 3,067,000	$ 3,111,000	$ 3,011,000
Property management services	1,346,000	1,365,000	1,265,000
Additional payment for the entity's share of all direct office expenses	$ 317,000	295,000	275,000
Majestic | Net lease tenants
Related Party Transactions
Property management costs as a percentage of rental payments	1.50%
Majestic | Operating lease tenants
Related Party Transactions
Property management costs as a percentage of rental payments	2.00%
Executive officers and others
Related Party Transactions
Stock incentive plan expense	$ 2,572,000	$ 2,590,000	$ 2,349,000

X

- Definition

Represents the amount of additional payment to related party for the share of direct office expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	olp_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount to be paid under the agreement with the related party.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Represents the amount of property management costs allocated to real estate expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

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X

- Definition

The percentage charged for managing real estate properties.

+ References

No definition available.

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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

No definition available.

+ Details

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- Details

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- Details

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X

- Details

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- Details

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