XML 62 R51.htm IDEA: XBRL DOCUMENT v3.20.2

Related Party Transactions - Joint Venture Partners and Affiliates (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Unconsolidated Joint Ventures
Related Party Transactions
Aggregate management fees paid to other partners	$ 18,000	$ 30,000	$ 40,000	$ 55,000
Decrease in equity earnings, joint venture transaction	9,000	15,000	20,000	28,000
Leasing commission and development fees paid to unconsolidated joint venture partner	75,000		75,000
Joint Venture Partners and Affiliates
Related Party Transactions
Real estate property management costs	$ 16,000	$ 20,000	$ 36,000	$ 41,000

X

- Definition

Aggregate management fees paid to other partners of the venture.

+ References

No definition available.

+ Details

Name:	olp_AggregateFeesPaidToOtherPartners
Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Reduction of equity in earnings of unconsolidated joint ventures on the consolidated statement of income.

+ References

No definition available.

+ Details

Name:	olp_DecreaseInEquityInEarningsJointVentureTransaction
Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of leasing commissions and development fees paid to an unconsolidated joint venture partner.

+ References

No definition available.

+ Details

Name:	olp_LeasingCommissionAndDevelopmentFeesPaidToUnconsolidatedJointVenturePartner
Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the aggregate costs related to management of properties during the reporting period.

+ References

No definition available.

+ Details

Name:	olp_RealEstatePropertyManagementCosts
Namespace Prefix:	olp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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.

+ Details

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

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=olp_UnconsolidatedJointVenturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=olp_JointVenturePartnersAndAffiliatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: