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Investment in Unconsolidated Joint Ventures (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 item property | Mar. 31, 2014 | Dec. 31, 2014 item property
Investment in Unconsolidated Joint Ventures |  |  |
Number of unconsolidated joint ventures | 4 olp_NumberOfUnconsolidatedJointVentures |  | 5 olp_NumberOfUnconsolidatedJointVentures
Number of properties owned and operated by each unconsolidated joint venture | 1 olp_NumberOfPropertiesOwnedAndOperatedByEachUnconsolidatedJointVenture |  | 1 olp_NumberOfPropertiesOwnedAndOperatedByEachUnconsolidatedJointVenture
Investment in unconsolidated joint ventures | $ 2,486,000 us-gaap_RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures |  | $ 4,907,000 us-gaap_RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures
Equity in earnings of unconsolidated joint ventures | 147,000 us-gaap_IncomeLossFromEquityMethodInvestments | 133,000 us-gaap_IncomeLossFromEquityMethodInvestments |
Shopko retail stores, Lincoln, Nebraska |  |  |
Variable Interest Entities |  |  |
Ownership percentage in variable interest entity | 50.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_UnconsolidatedJointVentureInLincolnNebraskaMember |  |
Purchase of remaining investment in unconsolidated joint venture | $ 6,300,000 olp_PurchaseOfRemainingInvestmentInUnconsolidatedJointVenture / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_UnconsolidatedJointVentureInLincolnNebraskaMember |  |

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- Definition Represents the number of properties owned and operated by each unconsolidated joint venture. + References No definition available. + Details
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- Definition Represents the number of unconsolidated joint ventures of the entity that are accounted for under the equity method of accounting. + References No definition available. + Details
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- Definition The purchase amount of remaining share of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments. + References No definition available. + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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- Definition The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685 + Details
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