XML 63 R47.htm IDEA: XBRL DOCUMENT v3.20.4

REAL ESTATE INVESTMENTS - Summary of acquisitions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Real Estate Acquisitions
Contract Purchase Price	$ 28,250	$ 49,250
Capitalized Transaction Costs	254	637
New mortgage debt	$ 18,200	$ 50,310
Minimum
Real Estate Acquisitions
Interest rate (as a percent)	3.54%	3.68%
Maximum
Real Estate Acquisitions
Interest rate (as a percent)	3.63%	4.90%
Creative Office Environments industrial facility, Ashland, Virginia
Real Estate Acquisitions
Contract Purchase Price	$ 9,100
Capitalized Transaction Costs	119
Fed Ex industrial facility, Lowell, Arkansas
Real Estate Acquisitions
Contract Purchase Price	19,150
Capitalized Transaction Costs	$ 135
Zwanenberg Food Group/Metro Carpets industrial facility, Nashville, Tennessee
Real Estate Acquisitions
Contract Purchase Price		$ 8,000
Capitalized Transaction Costs		77
Echo, Inc. industrial facility, Wauconda, Illinois
Real Estate Acquisitions
Contract Purchase Price		3,800
Capitalized Transaction Costs		26
Betz Mechanical Supply, Steve Davis Sales industrial Facility, Bensalem, Pennsylvania
Real Estate Acquisitions
Contract Purchase Price		6,200
Capitalized Transaction Costs		168
International Flora Technologies industrial facility, Chandler, Arizona
Real Estate Acquisitions
Contract Purchase Price		8,650
Capitalized Transaction Costs		64
Nissan North America industrial facility, LaGrange, Georgia
Real Estate Acquisitions
Contract Purchase Price		5,200
Capitalized Transaction Costs		72
Continental Hydraulics industrial facility, Shakopee, Minnesota
Real Estate Acquisitions
Contract Purchase Price		8,000
Capitalized Transaction Costs		62
Cosentino industrial facility, Rincon, Georgia
Real Estate Acquisitions
Contract Purchase Price		6,400
Capitalized Transaction Costs		121
The Door Mill industrial facility, Chandler, Arizona
Real Estate Acquisitions
Contract Purchase Price		3,000
Capitalized Transaction Costs		$ 47

X

- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth, excluding acquisition costs.

+ References

No definition available.

+ Details

Name:	olp_PaymentsToAcquireRealEstateExcludingAcquisitionCosts
Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the real estate acquisition cost capitalized.

+ References

No definition available.

+ Details

Name:	olp_RealEstateAcquisitionCostCapitalized
Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of increase in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from new investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 6))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=olp_CreativeOfficeEnvironmentsIndustrialFacilityAshlandVirginiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=olp_FedExIndustrialFacilityLowellArkansasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=olp_ZwanenbergFoodGroupMetroCarpetsIndustrialFacilityNashvilleTennesseeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=olp_EchoInc.IndustrialFacilityWaucondaIllinoisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=olp_BetzMechanicalSupplySteveDavisSalesIndustrialFacilityBensalemPennsylvaniaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=olp_InternationalFloraTechnologiesIndustrialFacilityChandlerArizonaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=olp_NissanNorthAmericaIndustrialFacilityLaGrangeGeorgiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=olp_ContinentalHydraulicsIndustrialFacilityShakopeeMinnesotaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=olp_CosentinoIndustrialFacilityRinconGeorgiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=olp_DoorMillIndustrialFacilityChandlerArizonaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: