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Lease Termination Fee Income (Details) (USD $) | 1 Months Ended
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Mar. 31, 2015
Lease Termination Fee Income |
Lease termination fee received from a retail tenant in a lease buy-out transaction | $ 650,000 olp_LeaseTerminationFeeGross
Write-off of entire balance of the unbilled rent receivable | $ 226,000 olp_WriteoffOfUnbilledRentReceivable

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- Definition Lease Termination Fee, Gross + 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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- Details
Name: | olp_LeaseTerminationFeeIncomeDisclosureAbstract
Namespace Prefix: | olp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Write-off of Unbilled Rent Receivable + References No definition available. + Details
Name: | olp_WriteoffOfUnbilledRentReceivable
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration