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OTHER INCOME (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
OTHER INCOME |  |
Income from resolution dispute | $ 243,000 |
Amount received for easements | $ 74,000 | $ 356,000

X
- Definition The amount represents consideration from Colorado Department of Transportation (CDOT) for acquisition of easements. + References No definition available. + Details
Name: | olp_ConsiderationAmountAttributableToSaleOfEasements
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents amount received from tenant for the resolution of a dispute. + References No definition available. + Details
Name: | olp_IncomeFromResolutionOfDisputeWithTenant
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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