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SIGNIFICANT ACCOUNTING POLICIES (Details)	1 Months Ended	12 Months Ended			12 Months Ended
	Feb. 29, 2012 Unconsolidated JV in Plano, Texas	Dec. 31, 2012 Consolidated JV one item	Dec. 31, 2012 Consolidated JV one Minimum	Dec. 31, 2012 Consolidated JV one Maximum	Dec. 31, 2012 Consolidated JV two item
Investment in Joint Ventures
Number of controlling interest in joint ventures		4
Ownership interest in consolidated joint venture (as a percent)			85.00%	95.00%
Ownership percentage in VIE's	90.00%
Number of other unconsolidated joint ventures					6

X

- Definition

Represents the number of joint ventures in which entity has controlling interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	olp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of unconsolidated joint ventures of the entity that are not separately disclosed within the note disclosures.

+ References

No definition available.

+ Details

Name:	olp_NumberOfOtherUnconsolidatedJointVentures
Namespace Prefix:	olp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 5A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759159-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration