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LEASES - As Lessor - Unbilled Straight-Line Rent (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unbilled Straight-Line Rent
Unbilled rent receivable	$ 15,037,000	$ 13,722,000
Period during which amount of unbilled rent receivable is to be billed and received	16 years
Unbilled straight-line rent receivables written off related to property sold	$ 182,000	45,000	$ 105,000
Unbilled rent payables	$ 662,000	0
Period during which amount of unbilled rent payable is to be billed and received	22 years
Unbilled rent straight-line rent receivable written off related to tenant bankruptcy	$ 548,000	$ 1,440,000	$ 362,000

X

- Definition

Represents the amount of rent reported on a straight-line basis less than rental payments required under the respective leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the period during which amount of rent is to be billed and received pursuant to the lease terms.

+ References

No definition available.

+ Details

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Namespace Prefix:	olp_
Data Type:	xbrli:durationItemType
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X

- Definition

Represents the period during which amount of rent is to be billed and received pursuant to the lease terms.

+ References

No definition available.

+ Details

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Namespace Prefix:	olp_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

Represents the amount of unbilled rent receivable written off during the period relating to properties sold.

+ References

No definition available.

+ Details

Name:	olp_StraightLineRentReceivableWrittenOffRelatingToPropertySold
Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount of unbilled rent receivable written off during the period related to tenant bankruptcy or going concern issues.

+ References

No definition available.

+ Details

Name:	olp_StraightLineRentReceivableWrittenOffRelatingToTenantFilingBankruptcyOrGoingConcernIssues
Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

n/a

+ References

No definition available.

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Name:	olp_UnbilledStraightLineRentAbstract
Namespace Prefix:	olp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=77913719&loc=d3e40879-112712

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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