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REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS - Lease Termination Fee (Details) | 1 Months Ended
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Jul. 31, 2018 USD ($)
Lease Termination Fee |
Lease termination fee | $ 372,000
Additional rental income from write-off of unamortized intangible lease liability and unbilled rent receivable | 804,000
Write-off of the unamortized intangible lease liability | 878,000
Write-off of unbilled rent receivable | $ 74,000

X
- Definition Additional Rental Income From Write-Off of Unamortized Intangible Lease Liability And Unbilled Rent Receivable + References No definition available. + Details
Name: | olp_AdditionalRentalIncomeFromWriteOffOfUnamortizedIntangibleLeaseLiabilityAndUnbilledRentReceivable
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount represents gross lease termination fee. + References No definition available. + Details
Name: | olp_LeaseTerminationFeeGross
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition n/a + References No definition available. + Details
Name: | olp_LeaseTerminationFeesAbstract
Namespace Prefix: | olp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of unbilled rent receivable written off during the period. + References No definition available. + Details
Name: | olp_WriteOffOfUnbilledRentReceivable
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount write-off of the unamortized intangible lease liability. + References No definition available. + Details
Name: | olp_WriteOffUnamortizedIntangibleLeaseLiability
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant