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SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2014 property | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 item
Revenue Recognition |  |  |  |
Additional rental income for the reimbursement of expenses |  | $ 2,561,000 us-gaap_TenantReimbursements | $ 1,694,000 us-gaap_TenantReimbursements | $ 947,000 us-gaap_TenantReimbursements
Purchase Accounting for Acquisition of Real Estate |  |  |  |
Estimated useful lives of building and intangible assets, minimum |  | 1 year |  |
Estimated useful lives of building and intangible assets, maximum |  | 54 years |  |
Properties Held-for-Sale |  |  |  |
Number of properties sold and reclassified to discontinued operations | 2 olp_NumberOfPropertiesAsTransferredAssetsAndLiabilitiesWhichSoldToBeReclassifiedAsPropertiesHeldForSale |  |  |
Escrow, Deposits and Other Assets and Receivables |  |  |  |
Escrow, Deposits, Other Assets and Receivables |  | 1,376,000 olp_EscrowDepositsOtherAssetsAndReceivables | 1,453,000 olp_EscrowDepositsOtherAssetsAndReceivables |
Allowance for Doubtful Accounts |  |  |  |
Balance in allowance for doubtful accounts |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivable |  |
Number of tenants from whom the doubtful collections were received |  |  |  | 1 olp_AllowanceForDoubtfulAccountsReceivableRecoveriesNumberOfTenants
Continuing operations |  |  |  |
Allowance for Doubtful Accounts |  |  |  |
Bad debt expense |  |  |  | 56,000 us-gaap_ProvisionForDoubtfulAccounts / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Discontinued operations |  |  |  |
Allowance for Doubtful Accounts |  |  |  |
Net recoveries of bad debt |  |  |  | $ 173,000 us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember

X
- Definition Represents the number of tenants from whom the amount of receivables doubtful of collection that was previously charged off was received. + References No definition available. + Details
Name: | olp_AllowanceForDoubtfulAccountsReceivableRecoveriesNumberOfTenants
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount related to Escrow, Deposits, Other Assets and Receivables related to real estate. + References No definition available. + Details
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Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the number of properties classified as transferred assets and liabilities in prior year period and sold in the current period to be re-classified as properties held-for-sale as of end of last year period. + References No definition available. + Details
Name: | olp_NumberOfPropertiesAsTransferredAssetsAndLiabilitiesWhichSoldToBeReclassifiedAsPropertiesHeldForSale
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum useful life of finite-lived intangible assets and long lived, physical assets used in the normal conduct of business and not intended for resale. + References No definition available. + Details
Name: | olp_PropertyPlantAndEquipmentAndIntangibleAssetsLiabilitiesUsefulLifeMaximum
Namespace Prefix: | olp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum useful life of finite-lived intangible assets and long lived, physical assets used in the normal conduct of business and not intended for resale. + References No definition available. + Details
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Namespace Prefix: | olp_
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Balance Type: | na
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- Details
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Balance Type: | na
Period Type: | duration

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

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- Definition Amount of recoveries of receivables doubtful of collection that were previously charged off. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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- Details
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- Definition In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses. + 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 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | credit
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- Details
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