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SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Depreciation and Amortization
Depreciation and amortization	$ 14,662,000us-gaap_DepreciationAndAmortization	$ 11,919,000us-gaap_DepreciationAndAmortization	$ 9,564,000us-gaap_DepreciationAndAmortization
Deferred Financing Costs
Accumulated amortization of deferred financing costs	4,379,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts	3,908,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts
Federal Income Taxes
Accrued federal excise tax based on taxable income generated but not yet distributed	$ 283,000olp_FederalExciseTaxAccruedOnUndistributedTaxableIncome	$ 45,000olp_FederalExciseTaxAccruedOnUndistributedTaxableIncome
Capital gain distributions (as a percent)	26.00%olp_CommonStockDividendsCashPaidCapitalGainPercentage	27.00%olp_CommonStockDividendsCashPaidCapitalGainPercentage
Commercial properties
Depreciation and Amortization
Estimated useful life	40 years

X

- Definition

Represents the percentage of aggregate cash distributions for dividends during the period, treated as capital gains for federal tax purposes.

+ References

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- Definition

Represents the amount of federal excise tax accrued during the period on taxable income generated but not yet distributed.

+ References

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- Definition

For an unclassified balance sheet, the accumulated amortization, as of the reporting date, representing the periodic charge to earnings of deferred costs which are associated with debt obligations existing as of the end of the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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