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Real Estate Acquisitions (Details) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 tenant | Mar. 31, 2014 | Dec. 31, 2014 | Mar. 31, 2015 | Jun. 30, 2014
Real Estate Acquisitions |  |  |  |  |  |  |
Contract Purchase Price | $ 3,664,000 us-gaap_PaymentsToAcquireInterestInJointVenture |  |  |  |  |  |
Third Party Real Estate Acquisition Costs | 248,000 olp_CostsOfAcquiringRealEstate |  | 40,000 olp_CostsOfAcquiringRealEstate |  |  |  |
Contributions from non-controlling interests | 663,000 us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination |  |  | 639,000 us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination |  |  |
Payment to purchase of partner's interest | 6,300,000 olp_PaymentsToPurchasePartnersInterestInUnconsolidatedJointVenture |  |  |  |  |  |
Purchase price fair value adjustment | 960,000 us-gaap_AssetsFairValueAdjustment |  |  |  |  |  |
Allocation of purchase price for the company's real estate acquisitions |  |  |  |  |  |  |
Land | 20,132,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand |  |  |  | 20,132,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand |  |
Building | 24,790,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings |  |  |  | 24,790,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings |  |
Building Improvements | 1,379,000 olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements |  |  |  | 1,379,000 olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements |  |
Intangible Lease Asset | 2,518,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles |  |  |  | 2,518,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles |  |
Intangible Lease Liability | (4,813,000)olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability |  |  |  | (4,813,000)olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability |  |
Total | 44,006,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  |  |  | 44,006,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  |
Number of tenants in the property | 1 olp_NumberOfTenantsInProperty |  |  |  |  |  |
Intangible lease assets | 2,518,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 |  |  |  |  |  |
Intangible lease liabilities | 4,782,000 us-gaap_BelowMarketLeaseAcquired |  |  |  |  |  |
Weighted average amortization period for intangible lease assets | 7 years |  |  |  |  |  |
Weighted average amortization period for intangible lease liabilities | 6 years 8 months 12 days |  |  |  |  |  |
Marston Park Plaza retail stores, Lakewood, Colorado |  |  |  |  |  |  |
Real Estate Acquisitions |  |  |  |  |  |  |
Contract Purchase Price | 17,485,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember | [1] |  |  |  |  |
Mortgage incurred | 11,853,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember | [1],[2] |  |  |  |  |
Third Party Real Estate Acquisition Costs | 184,000 olp_CostsOfAcquiringRealEstate / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember | [1],[3] |  |  |  |  |
Ownership interest in consolidated joint venture of non-controlling interest (as a percent) | 10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |  |  | 10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |
Contributions from non-controlling interests | 663,000 us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |  |  |  |  |
Interest rate (as a percent) | 4.12%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |  |  | 4.12%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |
Allocation of purchase price for the company's real estate acquisitions |  |  |  |  |  |  |
Land | 6,005,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |  |  | 6,005,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |
Building | 10,109,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |  |  | 10,109,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |
Building Improvements | 700,000 olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |  |  | 700,000 olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |
Intangible Lease Asset | 1,493,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |  |  | 1,493,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |
Intangible Lease Liability | (822,000)olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |  |  | (822,000)olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |
Total | 17,485,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |  |  | 17,485,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |
Number of tenant spaces at the property | 29 olp_NumberOfTenantSpacesAtTheProperty / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |  |  |  |  |
Percentage of property leased to tenants | 94.50%olp_AcquiredPropertyPercentageLeased / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember |  |  |  |  |  |
Marston Park Plaza retail stores, Lakewood, Colorado | Consolidated JV |  |  |  |  |  |  |
Real Estate Acquisitions |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) | 90.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember |  |  |  | 90.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyMarstonParkPlazaLakewoodColoradoMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember |  |
Interline Brands distribution facility, Louisville, Kentucky |  |  |  |  |  |  |
Real Estate Acquisitions |  |  |  |  |  |  |
Contract Purchase Price | 4,400,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |  |  |  |  |
Mortgage incurred | 2,640,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember | [4] |  |  |  |  |
Third Party Real Estate Acquisition Costs | 44,000 olp_CostsOfAcquiringRealEstate / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember | [3] |  |  |  |  |
Interest rate (as a percent) | 3.88%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |  |  | 3.88%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |
Allocation of purchase price for the company's real estate acquisitions |  |  |  |  |  |  |
Land | 578,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |  |  | 578,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |
Building | 3,622,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |  |  | 3,622,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |
Building Improvements | 105,000 olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |  |  | 105,000 olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |
Intangible Lease Asset | 95,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |  |  | 95,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |
Total | 4,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |  |  | 4,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInInterlineBrandsLouisvilleKentuckyMember |  |
Land - The Meadows Apartments, Lakemoor, Illinois |  |  |  |  |  |  |
Real Estate Acquisitions |  |  |  |  |  |  |
Contract Purchase Price | 9,300,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember |  |  |  | 9,300,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember |  |
Capitalized transaction costs incurred with the asset acquisition | 228,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember |  |  |  | 228,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember |  |
Allocation of purchase price for the company's real estate acquisitions |  |  |  |  |  |  |
Land | 9,528,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember | [5] |  |  | 9,528,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember | [5] |
Total | 9,528,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember | [5] |  |  | 9,528,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember | [5] |
Shopko retail store, Lincoln, Nebraska |  |  |  |  |  |  |
Real Estate Acquisitions |  |  |  |  |  |  |
Percentage of ownership in unconsolidated joint venture | 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember |  |  |  | 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember |  |
Allocation of purchase price for the company's real estate acquisitions |  |  |  |  |  |  |
Land | 4,009,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |  |  | 4,009,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |
Building | 11,040,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |  |  | 11,040,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |
Building Improvements | 574,000 olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |  |  | 574,000 olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |
Intangible Lease Asset | 930,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |  |  | 930,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |
Intangible Lease Liability | (3,960,000)olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |  |  | (3,960,000)olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |
Total | 12,593,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |  |  | 12,593,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember | [6] |
Shopko retail store, Lincoln, Nebraska | Consolidated JV |  |  |  |  |  |  |
Real Estate Acquisitions |  |  |  |  |  |  |
Percentage of equity method investments control obtained | 100.00%olp_EquityMethodInvestmentOwnershipPercentageControlObtained / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember |  |  |  |  |  |
Shopko retail store, Lincoln, Nebraska | Unconsolidated JV |  |  |  |  |  |  |
Real Estate Acquisitions |  |  |  |  |  |  |
Contract Purchase Price | 6,300,000 us-gaap_PaymentsToAcquireInterestInJointVenture / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_UnconsolidatedJointVenturesMember | [7] |  |  |  |  |
Percentage of ownership in unconsolidated joint venture | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_UnconsolidatedJointVenturesMember |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_UnconsolidatedJointVenturesMember |  |
Payment to purchase of partner's interest | 2,636,000 olp_PaymentsToPurchasePartnersInterestInUnconsolidatedJointVenture / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_UnconsolidatedJointVenturesMember |  |  |  |  |  |
Payment to purchase substantial interest | 3,664,000 olp_PaymentsToPurchaseSubstantialInterestInUnconsolidatedJointVenture / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_UnconsolidatedJointVenturesMember |  |  |  |  |  |
Percentage of equity method investments acquired | 50.00%olp_EquityMethodInvestmentOwnershipPercentageAcquired / us-gaap_BusinessAcquisitionAxis = olp_RetailPropertyClemmonsNorthCarolinaMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_UnconsolidatedJointVenturesMember |  |  |  |  |  |
Subtotals |  |  |  |  |  |  |
Real Estate Acquisitions |  |  |  |  |  |  |
Contract Purchase Price | 37,485,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |  |  |  |  |
Third Party Real Estate Acquisition Costs | 248,000 olp_CostsOfAcquiringRealEstate / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember | [3] |  |  |  |  |
Allocation of purchase price for the company's real estate acquisitions |  |  |  |  |  |  |
Land | 20,120,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |  |  | 20,120,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |
Building | 24,771,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |  |  | 24,771,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |
Building Improvements | 1,379,000 olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |  |  | 1,379,000 olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |
Intangible Lease Asset | 2,518,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |  |  | 2,518,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |
Intangible Lease Liability | (4,782,000)olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |  |  | (4,782,000)olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |
Total | 44,006,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |  |  | 44,006,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = olp_CurrentFiscalYearRealEstateAcquisitionsMember |  |
Other |  |  |  |  |  |  |
Real Estate Acquisitions |  |  |  |  |  |  |
Third Party Real Estate Acquisition Costs | 20,000 olp_CostsOfAcquiringRealEstate / us-gaap_BusinessAcquisitionAxis = olp_PriorFiscalYearRealEstateAcquisitionsMember | [3],[8] |  |  |  |  |
Allocation of purchase price for the company's real estate acquisitions |  |  |  |  |  |  |
Land | 12,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_PriorFiscalYearRealEstateAcquisitionsMember | [9] |  |  | 12,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_PriorFiscalYearRealEstateAcquisitionsMember | [9] |
Building | 19,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = olp_PriorFiscalYearRealEstateAcquisitionsMember | [9] |  |  | 19,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = olp_PriorFiscalYearRealEstateAcquisitionsMember | [9] |
Intangible Lease Liability | (31,000)olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability / us-gaap_BusinessAcquisitionAxis = olp_PriorFiscalYearRealEstateAcquisitionsMember | [9] |  |  | (31,000)olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability / us-gaap_BusinessAcquisitionAxis = olp_PriorFiscalYearRealEstateAcquisitionsMember | [9] |
Land - River Crossing Apartments, Sandy Springs, Georgia |  |  |  |  |  |  |
Real Estate Acquisitions |  |  |  |  |  |  |
Contract Purchase Price |  |  |  |  |  |  | $ 6,510,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember
[1] | Owned by a joint venture in which the Company has a 90% interest. The non-controlling interest contributed $663 for its 10% interest, which was equal to the fair value of such interest at the date of purchase.
[2] | The mortgage debt obtained in connection with the purchase bears interest at 4.12% per annum and matures February 2025.
[3] | Included as an expense in the accompanying consolidated statements of income.
[4] | The mortgage debt obtained in connection with the purchase bears interest at 3.88% per annum and matures February 2021.
[5] | Includes capitalized transaction costs of $228 incurred with this asset acquisition.
[6] | Fair value of the assets previously owned by an unconsolidated joint venture of the Company. The Company owns 100% of this property as a result of its purchase of its partner’s 50% interest on March 31, 2015.
[7] | The Company purchased its unconsolidated joint venture partner's 50% interest for $6,300. The payment was comprised of (i) $2,636 paid directly to the partner and (ii) $3,664, substantially all of which was used to pay off the partner’s 50% share of the underlying joint venture mortgage.
[8] | Costs incurred for transactions that were not consummated.
[9] | Adjustments to finalize the purchase price allocation relating to a property purchased in October 2014.

X
- Definition Represents the weighted average amortization period of finite-lived intangible liabilities acquired either individually or as part of a group. + References No definition available. + Details
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- Definition Represents the amount of addition, improvement, or renovation to a facility held for productive use including parking lot improvements acquired at the acquisition date. + References No definition available. + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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