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Basis of Preparation (Details 2) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2012 property | Jun. 30, 2011 General and Administrative expenses | Jun. 30, 2011 General and Administrative expenses | Jun. 30, 2011 Real estate expenses | Jun. 30, 2011 Real estate expenses
Basis of Preparation |  |  |  |  |
Number of properties sold, whose transferred assets and liabilities, are considered for reclassification | 2 |  |  |  |
Number of properties deemed held for sale considered as held for sale | 1 |  |  |  |
Prior period reclassification disclosures |  |  |  |  |
Property management costs |  | $ 150,000 | $ 300,000 | $ (150,000) | $ (300,000)

X
- Definition Represents the number of properties classified as properties deemed held-for-sale to be re-classified as properties held-for-sale as of end of last year period and at current balance sheet date. + References No definition available. + Details
Name: | olp_NumberOfPropertiesAsDeemedHeldForSaleToBeReclassifiedAsPropertiesHeldForSale
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of properties classified as transferred assets and liabilites in prior year period and sold in the current period to be re-classified as properties held-for-sale as of end of last year period. + References No definition available. + Details
Name: | olp_NumberOfPropertiesAsTransferredAssetsAndLiabilitesWhichSoldToBeReclassifiedAsPropertiesHeldForSale
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | olp_PriorPeriodReclassificationLineItems
Namespace Prefix: | olp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
Name: | us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration