XML 77 R65.htm IDEA: XBRL DOCUMENT
v3.21.2

OTHER INCOME - Interest Income on Loan Receivable (Details) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) item | Sep. 30, 2021 USD ($) property | Sep. 30, 2020 property
Interest Income on Loan Receivable |  |  |
Number of properties sold | property |  | 3 | 3
Real Estate in Houston, TX |  |  |
Interest Income on Loan Receivable |  |  |
Number of properties sold | item | 2 |  |
Term of loan | 1 year |  |
Percentage of seller-financing provided by the Company | 50.00% |  |
Real Estate in Houston, TX | Other income |  |  |
Interest Income on Loan Receivable |  |  |
Interest income on loans |  | $ 59,000 |
Real Estate in Houston, TX | Other receivables |  |  |
Interest Income on Loan Receivable |  |  |
Seller-financing provided by the Company | $ 4,612,500 |  |

X
- Definition Interest income generated by loans. + References No definition available. + Details
Name: | olp_InterestIncomeLoans
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | olp_InterestIncomeOnLoanReceivableAbstract
Namespace Prefix: | olp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of properties sold. + References No definition available. + Details
Name: | olp_NumberOfPropertiesSold
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of seller-financing financing provided by the Company + References No definition available. + Details
Name: | olp_PercentageOfSellerFinancingProvidedByCompany
Namespace Prefix: | olp_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The term of the loan provided by the Company. + References No definition available. + Details
Name: | olp_TermOfSellerFinancing
Namespace Prefix: | olp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableBeforeFeesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=olp_RealEstateInHoustonTexasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=olp_OtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |