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Other Income Items - Lease termination fee (Details) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Other Income Items |  |  |
Lease termination fee received from an industrial tenants in a lease buy-out transaction | $ 650,000 |  | $ 650,000
Write-off of unbilled rent receivable | $ 226,000 | $ 7,000 | $ 315,000

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

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: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration