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Lease Termination Fee (Details) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2018 | Sep. 30, 2017
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 | $ 362,000

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- 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

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

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- 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 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: | debit
Period Type: | duration

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- 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: | credit
Period Type: | instant