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Basis of Preparation (Details 2) | 12 Months Ended
--- | ---
Dec. 31, 2012 item
Basis of Preparation |
Number of properties sold for which operations were reclassified to discontinued operations | 5

X
- Definition Represents the number of properties sold in the prior year for which the operations were reclassified to discontinued operations. + References No definition available. + Details
Name: | olp_NumberOfPropertiesSoldForWhichOperationsWereReclassifiedToDiscontinuedOperations
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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