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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES AND SALES OF JOINT VENTURE PROPERTIES (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013 item	Dec. 31, 2012	Apr. 30, 2013
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES AND SALES OF JOINT VENTURE PROPERTIES
Number of unconsolidated joint ventures	5olp_NumberOfUnconsolidatedJointVentures	5olp_NumberOfUnconsolidatedJointVentures
Number of properties owned and operated by each unconsolidated joint venture	1olp_NumberOfPropertiesOwnedAndOperatedByEachUnconsolidatedJointVenture	1olp_NumberOfPropertiesOwnedAndOperatedByEachUnconsolidatedJointVenture
Investment in unconsolidated joint ventures	$ 4,907,000us-gaap_RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	$ 4,906,000us-gaap_RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures
Gain on disposition of real estate - unconsolidated joint venture		2,807,000olp_GainLossOnDispositionOfRealEstateInUnconsolidatedJointVenture
Equity in earnings of unconsolidated joint ventures	533,000us-gaap_IncomeLossFromEquityMethodInvestments	651,000us-gaap_IncomeLossFromEquityMethodInvestments	1,368,000us-gaap_IncomeLossFromEquityMethodInvestments
Unconsolidated JV in Plano, Texas
Investment in Unconsolidated Joint Ventures
Ownership percentage in variable interest entity				90.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_UnconsolidatedJointVentureInPlanoTexasMember
Gain on sale of equity interest in the joint venture				$ 1,898,000us-gaap_GainLossOnSaleOfInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_UnconsolidatedJointVentureInPlanoTexasMember

X

- Definition

Represents the pro rata share of the amount of gain or loss resulting from sale of property by unconsolidated joint venture.

+ References

No definition available.

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- Definition

Represents the number of properties owned and operated by each unconsolidated joint venture.

+ References

No definition available.

+ Details

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- Definition

Represents the number of unconsolidated joint ventures of the entity that are accounted for under the equity method of accounting.

+ References

No definition available.

+ Details

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- Definition

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.12)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 7

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- Definition

The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(d))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- 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=28200181&loc=SL6759159-111685

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