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FAIR VALUE MEASUREMENTS (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2014
Fair value on a non-recurring basis
Impairment charge	$ 1,093,000us-gaap_AssetImpairmentCharges
Property located in Morrow, Georgia
Fair value on a non-recurring basis
Impairment charge	1,093,000us-gaap_AssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMorrowGeorgiaMember
Fair Value, Measurements, Nonrecurring [Member] | Level 3 | Minimum
Fair value on a non-recurring basis
Price per square foot	25us-gaap_FairValueInputsPricePerSquareFoot / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Fair Value, Measurements, Nonrecurring [Member] | Level 3 | Maximum
Fair value on a non-recurring basis
Price per square foot	33us-gaap_FairValueInputsPricePerSquareFoot / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Fair Value, Measurements, Nonrecurring [Member] | Property located in Morrow, Georgia
Fair value on a non-recurring basis
Impairment charge	$ 1,093,000us-gaap_AssetImpairmentCharges / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMorrowGeorgiaMember

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ 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 FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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X

- Definition

Cost of construction of real property stated is a price per square foot, used as an input to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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