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Real Estate Acquisitions (Details) (USD $) | 3 Months Ended |  | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 22, 2013 | Mar. 22, 2013 Retail Property, North Carolina | Mar. 31, 2013 Retail Property, North Carolina
Real Estate Acquisitions |  |  |  |  |
Ownership interest in consolidated joint venture (as a percent) |  |  | 90.00% |  |
Purchase price |  |  |  | $ 4,640,000 |
Percentage of property net leased to KMart |  |  |  | 100.00% |
Third Party Real Estate Acquisition Costs | 151,000 | 43,000 |  |  | 113,000
Intangible lease assets |  |  |  |  | 211,000
Intangible lease liabilities |  |  |  |  | $ 823,000
Weighted average amortization period for intangible lease assets |  |  |  |  | 5 years 2 months 1 day
Weighted average amortization period for intangible lease liabilities |  |  |  |  | 5 years 2 months 1 day

X
- Definition Represents the weighted average amortization period of finite-lived intangible liabilities acquired either individually or as part of a group. + References No definition available. + Details
Name: | olp_AcquiredFiniteLivedIntangibleLiabilitiesWeightedAverageAmortizationPeriod
Namespace Prefix: | olp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expense consisting of acquisition related transaction costs. + References No definition available. + Details
Name: | olp_CostsOfAcquiringRealEstate
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of finite-lived intangible liabilities allocated by a lessor (acquirer) to lease agreements, which exist at acquisition of a leased property. + References No definition available. + Details
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Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Repesents the percentage of property net leased to the tenant. + References No definition available. + Details
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Namespace Prefix: | olp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionLineItems
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Period Type: | duration

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- Definition This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired. + References No definition available. + Details
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Balance Type: | debit
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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 + Details
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Balance Type: | credit
Period Type: | duration