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SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $) | 12 Months Ended | 1 Months Ended
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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) | $ 266,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | $ 19,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | $ 373,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities |
Fair market value of securities | 29,000 us-gaap_AvailableForSaleSecuritiesEquitySecurities |  |  |
Gain on sale of available-for-sale securities (to related party in 2014) | 134,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 6,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 9,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet |
Total cumulative net unrealized gain on all investments in equity and debt securities | 24,000 olp_AvailableforsaleSecuritiesCumulativeNetUnrealizedGain | 145,000 olp_AvailableforsaleSecuritiesCumulativeNetUnrealizedGain |  |
Sales proceeds and gross realized gains and losses on available-for-sale securities |  |  |  |
Sales proceeds | 266,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 19,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 373,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities |
Gross realized gains | 134,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 6,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 9,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |
Gould | BRT |  |  |  |
Investment in Available-For-Sale Securities |  |  |  |
Number of shares sold to related party |  |  |  | 37,081 olp_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) |  |  |  | 266,000 us-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 |  | 262,000 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_InvestmentTypeAxis = olp_BRTRealtyTrustMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember |  |
Cost of shares sold to related party |  |  |  | 132,000 us-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) |  |  |  | 134,000 us-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 |  |  |  | 132,000 us-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 |  |  |  | $ 266,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = olp_BRTRealtyTrustMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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