XML 36 R45.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Shares Issued Through Equity Offering Program (Details) (USD $) | 0 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 20, 2014 | Mar. 31, 2015
Shares Issued Through Equity Offering Program |  |
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement (in dollars) | $ 38,360,000 olp_MaximumAggregateSalesPriceOfSharesToBeSoldUnderEquityOfferingProgram |
Number of shares sold |  | 0 us-gaap_StockIssuedDuringPeriodSharesNewIssues

X
- Definition Represents the maximum aggregate sales price of shares to be sold under an equity offering program. + References No definition available. + Details
Name: | olp_MaximumAggregateSalesPriceOfSharesToBeSoldUnderEquityOfferingProgram
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | olp_PublicOfferingDisclosureAbstract
Namespace Prefix: | olp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration