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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF INCOME
General and administrative, related parties	$ 2,385us-gaap_CostsAndExpensesRelatedParty	$ 2,679us-gaap_CostsAndExpensesRelatedParty	$ 2,679us-gaap_CostsAndExpensesRelatedParty
Real estate expenses, related party	$ 850olp_RealEstateCostsAndExpensesRelatedParty	$ 600olp_RealEstateCostsAndExpensesRelatedParty	$ 600olp_RealEstateCostsAndExpensesRelatedParty

X

- Definition

Amount representing the costs and operating expenses for the period related to transactions with the related parties.

+ References

No definition available.

+ Details

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

X

- Definition

Costs of sales and operating expenses for the period incurred from transactions with related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_CostsAndExpensesRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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