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Allowance for Doubtful Accounts (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2016 USD ($) item	Jun. 30, 2016 USD ($)	Jun. 30, 2015	Jun. 30, 2016 USD ($)	Jun. 30, 2015
Allowance for Doubtful Accounts
Bad debt expense		$ 37,000		$ 190,000
Net book value of property		$ 2,711,000		2,711,000
Impairment charge				$ 0
Colorado Department of Transportation
Allowance for Doubtful Accounts
Deposit received in advance	$ 466,000
Area of land associated with property (as a percent)	5.00%
Number of parking spaces | item	20
Maximum
Allowance for Doubtful Accounts
Percentage of rental income		1.00%	1.00%	1.00%	1.00%

X

- Definition

Percentage of land area associated with real estate property.

+ References

No definition available.

+ Details

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X

- Definition

This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Number of parking space associated with real estate property.

+ References

No definition available.

+ Details

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Namespace Prefix:	olp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represent the percentage of the company's rental income accounted by the tenant.

+ References

No definition available.

+ Details

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Namespace Prefix:	olp_
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Balance Type:	na
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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X

- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

+ Details

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Balance Type:	debit
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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 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 2: 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=56944662&loc=d3e3602-108585

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Balance Type:	debit
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X

- Definition

The book value of investments in real estate joint ventures including direct and indirect investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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