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SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	1 Months Ended	12 Months Ended		1 Months Ended
	Feb. 28, 2014 property	Dec. 31, 2014 item	Dec. 31, 2013 item	Jun. 30, 2014
Investment in Joint Ventures
Number of joint ventures with controlling interest		7olp_NumberOfControllingInterestJointVentures
Revenue from the ground lease		$ 531,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Unbilled rent receivable		12,815,000us-gaap_DeferredRentReceivablesNet	13,743,000us-gaap_DeferredRentReceivablesNet
Land		165,153,000us-gaap_Land	153,529,000us-gaap_Land
Accrued expenses and other liabilities		12,451,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent	7,790,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
Non-controlling interests in joint ventures		1,628,000us-gaap_MinorityInterest	1,158,000us-gaap_MinorityInterest
Number of unconsolidated joint ventures		5olp_NumberOfUnconsolidatedJointVentures	5olp_NumberOfUnconsolidatedJointVentures
Reclassification
Number of Properties as Transferred Assets and Liabilities which Sold to be Reclassified as Properties Held for Sale	2olp_NumberOfPropertiesAsTransferredAssetsAndLiabilitiesWhichSoldToBeReclassifiedAsPropertiesHeldForSale
Noxell Corporation industrial building, Joppa, Maryland
Investment in Joint Ventures
Restricted assets		0us-gaap_OtherRestrictedAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Land		3,805,000us-gaap_Land / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Buildings and improvements, net of depreciation		8,069,000olp_InvestmentBuildingAndBuildingImprovementsNetOfDepreciation / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Cash		527,000us-gaap_Cash / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Prepaid expenses and receivables		42,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Accrued expenses and other liabilities		152,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Non-controlling interests in joint ventures		312,000us-gaap_MinorityInterest / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Ownership interest in consolidated joint venture (as a percent)		95.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Land - River Crossing Apartments, Sandy Springs, Georgia
Investment in Joint Ventures
Contract Purchase Price				6,510,000us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringsGeorgiaMember
Number of apartment units in the complex purchased		196olp_NumberOfApartmentComplexUnitsPurchased / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringsGeorgiaMember
Maximum exposure to loss		6,712,000us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringsGeorgiaMember
Carrying value of the land		6,516,000us-gaap_LandAvailableForSale / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringsGeorgiaMember
Unbilled rent receivable		$ 196,000us-gaap_DeferredRentReceivablesNet / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringsGeorgiaMember
Consolidated JV
Investment in Joint Ventures
Number of joint ventures with controlling interest		7olp_NumberOfControllingInterestJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember
Consolidated JV | Minimum
Investment in Joint Ventures
Ownership interest in consolidated joint venture (as a percent)		85.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Consolidated JV | Non Variable Interest Entity
Investment in Joint Ventures
Number of joint ventures with controlling interest		6olp_NumberOfControllingInterestJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_NonVariableInterestEntityMember
Consolidated JV | Non Variable Interest Entity | Minimum
Investment in Joint Ventures
Ownership interest in consolidated joint venture (as a percent)		85.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_NonVariableInterestEntityMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Consolidated JV | Non Variable Interest Entity | Maximum
Investment in Joint Ventures
Ownership interest in consolidated joint venture (as a percent)		95.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_NonVariableInterestEntityMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Consolidated JV | MCB Real Estate LLC And Its Affiliates
Investment in Joint Ventures
Number of joint ventures with controlling interest		6olp_NumberOfControllingInterestJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_MCBRealEstateLLCAndItsAffiliatesMember
Unconsolidated JV
Investment in Joint Ventures
Number of unconsolidated joint ventures		5olp_NumberOfUnconsolidatedJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_UnconsolidatedJointVentureMember

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