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Other Income Items - Lease termination fee (Details) - USD ($)	1 Months Ended	9 Months Ended
	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Income Items
Lease termination fee received from an industrial tenants in a lease buy-out transaction	$ 650,000		$ 650,000
Write-off of unbilled rent receivable	$ 226,000	$ 7,000	$ 315,000

X

- Definition

Amount represents gross lease termination fee.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the amount of unbilled rent receivable written off during the period.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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