XML 36 R35.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Basis of Preparation (Details 2) | 0 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2012 property | Sep. 30, 2012 property | Sep. 30, 2012 property
Basis of Preparation |  |  |
Number of properties sold, whose transferred assets and liabilities, are considered for reclassification |  | 3 | 3
Number of properties deemed held for sale considered as held for sale | 1 |  |

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 liabilities 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_NumberOfPropertiesAsTransferredAssetsAndLiabilitiesWhichSoldToBeReclassifiedAsPropertiesHeldForSale
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
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