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Related Party Transactions (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Majestic |  |
Related Party Transaction |  |
Quarterly fees under compensation and services agreement | $ 633,750 olp_RelatedPartyTransactionQuarterlyFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember | $ 825,000 olp_RelatedPartyTransactionQuarterlyFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember
Overhead expenses under compensation and services agreement | 48,900 olp_RelatedPartyTransactionQuarterlyFeesOverheadExpenses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember | 46,600 olp_RelatedPartyTransactionQuarterlyFeesOverheadExpenses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember
Management fees under compensation and services agreement | 223,100 olp_RelatedPartyTransactionQuarterlyFeesManagementFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember | 212,500 olp_RelatedPartyTransactionQuarterlyFeesManagementFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_MajesticPropertyManagementCorpMember
Chairman |  |
Related Party Transaction |  |
Quarterly fees under compensation and services agreement | 65,625 olp_RelatedPartyTransactionQuarterlyFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember | 62,500 olp_RelatedPartyTransactionQuarterlyFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember
Vice Chairman |  |
Related Party Transaction |  |
Quarterly fees under compensation and services agreement | 26,250 olp_RelatedPartyTransactionQuarterlyFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_BoardOfDirectorsViceChairmanMember | 25,000 olp_RelatedPartyTransactionQuarterlyFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_BoardOfDirectorsViceChairmanMember
Gould Investors L.P. |  |
Related Party Transaction |  |
Share of property insurance premiums | 57,000 us-gaap_RealEstateInsurance / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember | 50,000 us-gaap_RealEstateInsurance / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = olp_GouldInvestorsLPMember
Joint venture partners |  |
Related Party Transaction |  |
Real estate management and acquisition costs | $ 105,000 olp_RealEstatePropertyManagementAndAcquisitionCosts / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CoVenturerMember | $ 12,000 olp_RealEstatePropertyManagementAndAcquisitionCosts / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CoVenturerMember

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- Definition Represents the aggregate costs related to management and acquisition of properties during the reporting period. + References No definition available. + Details
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Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the quarterly amount to be paid under the agreement with the related party for the current fiscal year. + References No definition available. + Details
Name: | olp_RelatedPartyTransactionQuarterlyFees
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents management fees included in the quarterly amount to be paid under the agreement with the related party for the current fiscal year. + References No definition available. + Details
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Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents overhead expenses included in the quarterly amount to be paid under the agreement with the related party for the current fiscal year. + References No definition available. + Details
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Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A contract to provide coverage or protection in exchange for a payment or "premium". Examples of insurance protection include liability and property insurance. The entity paying the premiums for the protection will have insurance expense and possibly an asset, Prepaid Insurance (if the premiums are paid in advance). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.6) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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X
- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |