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FAIR VALUE MEASUREMENTS (Details 5) (USD $) | 12 Months Ended
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Dec. 31, 2014
Fair value on a non-recurring basis |
Impairment charge | $ 1,093,000 us-gaap_AssetImpairmentCharges
Property located in Morrow, Georgia |
Fair value on a non-recurring basis |
Impairment charge | 1,093,000 us-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 | 25 us-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 | 33 us-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 | $ 1,093,000 us-gaap_AssetImpairmentCharges / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMorrowGeorgiaMember

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- 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 + Details
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- 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 + Details
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- Details
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