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Organization and Background (Details)	Sep. 30, 2012 state property
Organization and Background
Number of real estate properties	97
Number of properties owned as tenancy in common interest	1
Percentage of ownership as a tenant in common interest	50.00%
Number of states in which properties are located	29
Wholly owned properties
Organization and Background
Number of real estate properties	91
Properties owned by consolidated joint ventures
Organization and Background
Number of real estate properties	2
Properties owned by unconsolidated joint ventures
Organization and Background
Number of real estate properties	6

X

- Definition

Represents the number of real estate properties owned as tenancy in common interest.

+ References

No definition available.

+ Details

Name:	olp_NumberOfRealEstatePropertiesOwnedAsTenancyInCommonInterest
Namespace Prefix:	olp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the percentage of ownership of the entity as a tenant in common interest.

+ References

No definition available.

+ Details

Name:	olp_TenancyInCommonInterestOwnershipPercentage
Namespace Prefix:	olp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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