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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

X

- Details

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