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RELATED PARTY TRANSACTIONS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
RELATED PARTY TRANSACTIONS
Number of shares of common stock owned by the related party	15,728,000us-gaap_CommonStockSharesOutstanding	15,221,000us-gaap_CommonStockSharesOutstanding
Number of shares purchased by the related party under the dividend reinvestment plan	227,000us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan	210,000us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan	215,000us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Amount of fee reduction	$ 445,000olp_RelatedPartyTransactionAmountOfReductionInFeePaid
Cost of plans charged to operations	1,833,000us-gaap_AllocatedShareBasedCompensationExpense	1,440,000us-gaap_AllocatedShareBasedCompensationExpense	1,223,000us-gaap_AllocatedShareBasedCompensationExpense
Annual lease rent	296,875olp_OperatingLeasesAnnualFixedRent
Gould
RELATED PARTY TRANSACTIONS
Number of shares of common stock owned by the related party	1,704,765us-gaap_CommonStockSharesOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember	1,597,304us-gaap_CommonStockSharesOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Ownership percentage held by the related party	10.50%olp_RelatedPartyTransactionOwnershipPercentageHeld / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember	10.20%olp_RelatedPartyTransactionOwnershipPercentageHeld / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Number of shares purchased by the related party under the dividend reinvestment plan	106,761us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember	69,595us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Number of shares purchased by the related party in the open market	700olp_NumbersOfSharesPurchasedInOpenMarketDuringPeriod / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember	3,700olp_NumbersOfSharesPurchasedInOpenMarketDuringPeriod / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Amount of insurance reimbursed	400,000olp_RelatedPartyTransactionAmountOfPropertyInsuranceReimbursed / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember	359,000olp_RelatedPartyTransactionAmountOfPropertyInsuranceReimbursed / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember	305,000olp_RelatedPartyTransactionAmountOfPropertyInsuranceReimbursed / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Majestic
RELATED PARTY TRANSACTIONS
Annual fee paid in consideration for providing services	2,669,000olp_RelatedPartyTransactionAnnualFeesPaidForServices / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember	2,725,000olp_RelatedPartyTransactionAnnualFeesPaidForServices / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember	2,725,000olp_RelatedPartyTransactionAnnualFeesPaidForServices / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember
Property management costs allocated to real estate expenses annually	850,000olp_RelatedPartyTransactionPropertyManagementCostAllocatedToRealEstateExpensesAnnually / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember	600,000olp_RelatedPartyTransactionPropertyManagementCostAllocatedToRealEstateExpensesAnnually / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember	600,000olp_RelatedPartyTransactionPropertyManagementCostAllocatedToRealEstateExpensesAnnually / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember
Additional payment for the entity's share of all direct office expenses	186,000olp_RelatedPartyTransactionAdditionalPaymentForShareOfDirectOfficeExpenses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember	175,000olp_RelatedPartyTransactionAdditionalPaymentForShareOfDirectOfficeExpenses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember	175,000olp_RelatedPartyTransactionAdditionalPaymentForShareOfDirectOfficeExpenses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember
Chairman
RELATED PARTY TRANSACTIONS
Fee paid	250,000olp_RelatedPartyTransactionAmountPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember	250,000olp_RelatedPartyTransactionAmountPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember	250,000olp_RelatedPartyTransactionAmountPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember
Vice Chairman
RELATED PARTY TRANSACTIONS
Fee paid	100,000olp_RelatedPartyTransactionAmountPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_BoardOfDirectorsViceChairmanMember	100,000olp_RelatedPartyTransactionAmountPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_BoardOfDirectorsViceChairmanMember	100,000olp_RelatedPartyTransactionAmountPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_BoardOfDirectorsViceChairmanMember
Subsidiary of Gould
RELATED PARTY TRANSACTIONS
Annual lease rent	42,000olp_OperatingLeasesAnnualFixedRent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_SubsidiaryOfGouldInvestorsLPMember	41,000olp_OperatingLeasesAnnualFixedRent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_SubsidiaryOfGouldInvestorsLPMember	41,000olp_OperatingLeasesAnnualFixedRent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_SubsidiaryOfGouldInvestorsLPMember
Executive officers and others
RELATED PARTY TRANSACTIONS
Cost of plans charged to operations	$ 1,045,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_ExecutiveOfficersAndOthersMember	$ 867,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_ExecutiveOfficersAndOthersMember	$ 743,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_ExecutiveOfficersAndOthersMember

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Number of shares was purchased in open market during the period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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