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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		$ 2,561,000us-gaap_TenantReimbursements	$ 1,694,000us-gaap_TenantReimbursements	$ 947,000us-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	2olp_NumberOfPropertiesAsTransferredAssetsAndLiabilitiesWhichSoldToBeReclassifiedAsPropertiesHeldForSale
Escrow, Deposits and Other Assets and Receivables
Escrow, Deposits, Other Assets and Receivables		1,376,000olp_EscrowDepositsOtherAssetsAndReceivables	1,453,000olp_EscrowDepositsOtherAssetsAndReceivables
Allowance for Doubtful Accounts
Balance in allowance for doubtful accounts		0us-gaap_AllowanceForDoubtfulAccountsReceivable
Number of tenants from whom the doubtful collections were received				1olp_AllowanceForDoubtfulAccountsReceivableRecoveriesNumberOfTenants
Continuing operations
Allowance for Doubtful Accounts
Bad debt expense				56,000us-gaap_ProvisionForDoubtfulAccounts / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Discontinued operations
Allowance for Doubtful Accounts
Net recoveries of bad debt				$ 173,000us-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

Name:	olp_EscrowDepositsOtherAssetsAndReceivables
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

Name:	olp_PropertyPlantAndEquipmentAndIntangibleAssetsLiabilitiesUsefulLifeMinimum
Namespace Prefix:	olp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- 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

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of recoveries of receivables doubtful of collection that were previously charged off.

+ References

No definition available.

+ Details

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- 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

Name:	us-gaap_TenantReimbursements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementOperatingActivitiesSegmentAxis=us-gaap_SegmentContinuingOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementOperatingActivitiesSegmentAxis=us-gaap_SegmentDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: