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Sale and Disposal of Properties and Discontinued Operations ( Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jan. 13, 2015	Feb. 03, 2014 property	Dec. 31, 2013
Discontinued operations and real estate investments
Total sales price, net of closing costs	$ 16,025,000us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment	$ 5,177,000us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment
Discontinued Operations
Mortgage balance paid off	7,376,000us-gaap_ExtinguishmentOfDebtAmount
Swap termination expense	472,000us-gaap_GainLossOnContractTermination
Write off of deferred financing costs	249,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
Income from discontinued operations		13,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Rental income		141,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome
Real estate expenses		17,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
Mortgage interest		111,000us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense
Non-Controlling Interests in Joint Ventures
Discontinued Operations
Non-controlling interest's share of income from the transaction	1,320,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Property located in Cherry Hill, NJ | Consolidated JV | Real Estate in Cherry Hill, NJ
Discontinued operations and real estate investments
Total sales price, net of closing costs			16,025,000us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_PropertyLocatedInCherryHillNjMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = olp_CherryHillNJMember
Discontinued Operations
Gain on sale of property			5,392,000us-gaap_GainLossOnSaleOfProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_PropertyLocatedInCherryHillNjMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = olp_CherryHillNJMember
Real estate property located in Michigan
Discontinued operations and real estate investments
Number of properties under contract of sale				2olp_NumberOfPropertiesUnderContractOfSale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMichiganMember
Total sales price, net of closing costs				5,177,000us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMichiganMember
Discontinued Operations
Impairment charge					$ 61,700us-gaap_AssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMichiganMember

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Number of properties under contract of sale.

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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.

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Amount of interest expense allocated to disposal group, including a discontinued operation.

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Amount of operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of rental income attributable to the disposal group, including a component of the entity (discontinued operation).

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Gross amount of debt extinguished.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items, which is apportioned to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This item includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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