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Lease Termination Fee Income (Details) (USD $)	1 Months Ended
	Jun. 30, 2014
Lease Termination Fee Income
Lease termination fee received from a retail tenant in a lease buy-out transaction	$ 1,269,000
Write-off of entire balance of the unbilled rent receivable and the intangible lease asset	$ 150,000

X

- Definition

Represents the gross amount of lease termination fee income during the reporting period.

+ References

No definition available.

+ Details

Name:	olp_LeaseTerminationFeeGross
Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	olp_LeaseTerminationFeeIncomeDisclosureAbstract
Namespace Prefix:	olp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the write-off of the unbilled rent receivable and the intangible lease asset.

+ References

No definition available.

+ Details

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