XML 84 R72.htm IDEA: XBRL DOCUMENT
v3.22.0.1

RELATED PARTY TRANSACTIONS - Other (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Real estate expenses |  |  |
Related Party Transactions |  |  |
Insurance expense recognized of amounts reimbursed to related party | $ 1,267,000 | $ 1,091,000 | $ 927,000
Chairman | General and administrative expense |  |  |
Related Party Transactions |  |  |
Aggregate fees paid | 298,000 | 298,000 | 289,000
Vice Chairman | General and administrative expense |  |  |
Related Party Transactions |  |  |
Aggregate fees paid | $ 119,000 | $ 119,000 | 116,000
Gould Investors L.P. |  |  |
Related Party Transactions |  |  |
Number of common stock shares owned by the related party | 1,921,712 | 1,894,883 |
Ownership percentage held by a related party | 9.20% | 9.20% |
Amount of insurance reimbursed | $ 1,402,000 | $ 1,168,000 | $ 1,025,000

X
- Definition Number of shares of common stock owned by related party + References No definition available. + Details
Name: | olp_AmountOfSharesOfCommonStockOwnedByRelatedParty
Namespace Prefix: | olp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Insurance expense recognized of amounts reimbursed to related party + References No definition available. + Details
Name: | olp_InsuranceExpenseRecognizedAmountsReimbursedToRelatedParty
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate amount of payments for key management services. + References No definition available. + Details
Name: | olp_RelatedPartyAggregatePaymentsForKeyManagementServices
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of reimbursement of property insurance under the related party transactions. + References No definition available. + Details
Name: | olp_RelatedPartyTransactionAmountOfPropertyInsuranceReimbursed
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the percentage of ownership held by the related party. + References No definition available. + Details
Name: | olp_RelatedPartyTransactionOwnershipPercentageHeld
Namespace Prefix: | olp_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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: | us-gaap_IncomeStatementLocationAxis=olp_RealEstateExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_BoardOfDirectorsChairmanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=olp_BoardOfDirectorsViceChairmanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=olp_GouldInvestorsLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |