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Subsequent Event (Details) (Subsequent event, Real estate property located in Michigan, USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013 property
Subsequent event | Real estate property located in Michigan |
Subsequent event |
Number of properties under contract of sale | 2
Aggregate purchase price for properties under contract of sale | $ 5.5

X
- Definition Aggregate purchase price for properties under contract of sale. + References No definition available. + Details
Name: | olp_AggregatePurchasePriceForPropertiesUnderContractOfSale
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of properties under contract of sale. + References No definition available. + Details
Name: | olp_NumberOfPropertiesUnderContractOfSale
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration