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Lease Termination Fee Income (Details) (USD $) | 1 Months Ended
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Jun. 30, 2014
Lease Termination Fee Income |
Lease termination fee received from a retail tenant in a lease buy-out transaction | $ 1,269,000
Write-off of entire balance of the unbilled rent receivable and the intangible lease asset | $ 150,000

X
- Definition Represents the gross amount of lease termination fee income during the reporting period. + References No definition available. + Details
Name: | olp_LeaseTerminationFeeGross
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | olp_LeaseTerminationFeeIncomeDisclosureAbstract
Namespace Prefix: | olp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the write-off of the unbilled rent receivable and the intangible lease asset. + References No definition available. + Details
Name: | olp_WriteoffOfUnbilledRentReceivableAndIntangibleLeaseAsset
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration