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LEASES - As Lessor (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
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	$ 19,536,000	$ 18,272,000
Variable lease revenues	4,382,000	3,796,000
Lease revenues	23,918,000	22,068,000
Amortization of acquired intangible lease assets/liabilities	$ 252,000	$ 378,000

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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Balance Type:	credit
Period Type:	duration

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_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- 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

+ Details

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X

- 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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X

- References

No definition available.

+ Details

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