XML 31 R11.htm IDEA: XBRL DOCUMENT  v2.3.0.11

Investment in Unconsolidated Joint Ventures	6 Months Ended
	Jun. 30, 2011
Investment in Unconsolidated Joint Ventures
Investment in Unconsolidated Joint Ventures	Note 4 - Investment in Unconsolidated Joint Ventures The Company’s five unconsolidated joint ventures each own and operate one property, including a 50% owned joint venture which acquired a retail property in March 2011 for a total purchase price of $3,200,000.  At June 30, 2011 and December 31, 2010, the Company’s equity investment in unconsolidated joint ventures totaled $5,287,000 and $4,777,000, respectively. In addition to the $107,000 gain on sale of property in the three and six months ended June 30, 2010, the Company recorded equity in earnings of $135,000 and $253,000 for the six months ended June 30, 2011 and 2010, respectively, and $105,000 and $128,000 for the three months ended June 30, 2011 and 2010, respectively.

X

- Details

Name:	olp_InvestmentsInUnconsolidatedJointVenturesAbstract
Namespace Prefix:	olp
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This item represents disclosure of information related to investments in unconsolidated joint ventures.

+ Details

Name:	olp_InvestmentsInUnconsolidatedJointVentureTextBlock
Namespace Prefix:	olp
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration