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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