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LEASES - As Lessor (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessor Accounting
Operating Lease, option to extend	true
Operating Lease, option to terminate	true
Practical expedient, single lease component	false
Components of lease revenues
Fixed lease revenues	$ 75,935	$ 74,101	$ 70,387
Variable lease revenues	13,759	17,259	11,008
Lease revenues	89,694	91,360	81,395
Additional rent accrued from a ground lease tenant		4,626
Amortization related to lease intangible assets and liabilities	$ 952	$ 831	$ 785

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- Definition

Additional rent accrued from ground lease tenant.

+ References

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X

- Definition

Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. Excluding amortization related to lease intangible assets and liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	olp_
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X

- Definition

Amount of operating lease income from lease payments paid and payable to lessor. Excludes variable lease payments not included in measurement of lease receivable. Also excludes amortization related to lease intangible assets and liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	olp_
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X

- Definition

Amount of operating lease income from variable lease payments paid and payable to lessor, excluding amount included in measurement of lease receivable. Also excluding amortization related to lease intangible assets and liabilities.

+ References

No definition available.

+ Details

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X

- Definition

Amount of non-cash amortization of intangible asset (liability) for above and below market leases.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Indicates (true false) whether practical expedient is elected to account for lease component and nonlease component as single lease component.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (a)
-SubTopic 30
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-3A

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- References

No definition available.

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- Definition

Indicates (true false) whether lessor has option to extend operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-3

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- Definition

Indicates (true false) whether lessor has option to terminate operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-3

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- References

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