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Lease Termination Fee Income (Details) (USD $)	1 Months Ended
	Mar. 31, 2015
Lease Termination Fee Income
Lease termination fee received from a retail tenant in a lease buy-out transaction	$ 650,000olp_LeaseTerminationFeeGross
Write-off of entire balance of the unbilled rent receivable	$ 226,000olp_WriteoffOfUnbilledRentReceivable

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- Definition

Lease Termination Fee, Gross

+ 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

Write-off of Unbilled Rent Receivable

+ References

No definition available.

+ Details

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