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SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 31, 2014
Investment in Available-For-Sale Securities
Net proceeds from sale of available-for-sale securities(to related party in 2014)	$ 266,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	$ 19,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	$ 373,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Fair market value of securities	29,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
Gain on sale of available-for-sale securities (to related party in 2014)	134,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	6,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	9,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Total cumulative net unrealized gain on all investments in equity and debt securities	24,000olp_AvailableforsaleSecuritiesCumulativeNetUnrealizedGain	145,000olp_AvailableforsaleSecuritiesCumulativeNetUnrealizedGain
Sales proceeds and gross realized gains and losses on available-for-sale securities
Sales proceeds	266,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	19,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	373,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Gross realized gains	134,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	6,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	9,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gould | BRT
Investment in Available-For-Sale Securities
Number of shares sold to related party				37,081olp_RelatedPartyTransactionNumberOfSharesSold / us-gaap_InvestmentTypeAxis = olp_BRTRealtyTrustMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Net proceeds from sale of available-for-sale securities(to related party in 2014)				266,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = olp_BRTRealtyTrustMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Period based on which average of the closing prices considered for proceeds from related party				30 days
Fair market value of securities		262,000us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_InvestmentTypeAxis = olp_BRTRealtyTrustMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Cost of shares sold to related party				132,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = olp_BRTRealtyTrustMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Gain on sale of available-for-sale securities (to related party in 2014)				134,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_InvestmentTypeAxis = olp_BRTRealtyTrustMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Gain reclassified from accumulated other comprehensive loss on the balance sheet into earnings				132,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / us-gaap_InvestmentTypeAxis = olp_BRTRealtyTrustMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Sales proceeds and gross realized gains and losses on available-for-sale securities
Sales proceeds				$ 266,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = olp_BRTRealtyTrustMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember

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