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OTHER INCOME (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
OTHER INCOME
Income from resolution dispute	$ 243,000
Amount received for easements	$ 74,000	$ 356,000

X

- Definition

The amount represents consideration from Colorado Department of Transportation (CDOT) for acquisition of easements.

+ References

No definition available.

+ Details

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

X

- Definition

Represents amount received from tenant for the resolution of a dispute.

+ References

No definition available.

+ Details

Name:	olp_IncomeFromResolutionOfDisputeWithTenant
Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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