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Subsequent Event (Details) (Subsequent event, Real estate property located in Michigan, USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 property
Subsequent event | Real estate property located in Michigan
Subsequent event
Number of properties under contract of sale	2
Aggregate purchase price for properties under contract of sale	$ 5.5

X

- Definition

Aggregate purchase price for properties under contract of sale.

+ References

No definition available.

+ Details

Name:	olp_AggregatePurchasePriceForPropertiesUnderContractOfSale
Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of properties under contract of sale.

+ References

No definition available.

+ Details

Name:	olp_NumberOfPropertiesUnderContractOfSale
Namespace Prefix:	olp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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