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Lease Termination Fee Income (Details) - USD ($) | 1 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2015 | Jun. 30, 2014 | Jun. 30, 2015
Lease Termination Fee Income |  |  |
Lease termination fee received from a retail tenant in a lease buy-out transaction | $ 650,000 | $ 1,269,000 |
Write-off of entire balance of the unbilled rent receivable and the intangible lease asset |  | $ 150,000 |
Write-off of entire balance of the unbilled rent receivable | $ 226,000 |  | $ 226,000

X
- 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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- Definition Lease Termination Fee Income + References No definition available. + Details
Name: | olp_LeaseTerminationFeeIncomeDisclosureAbstract
Namespace Prefix: | olp_
Data Type: | xbrli:stringItemType
Balance Type: | na
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

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