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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
COMMITMENTS AND CONTINGENCIES      
Pension expense $ 191,000us-gaap_PensionExpense $ 147,000us-gaap_PensionExpense $ 128,000us-gaap_PensionExpense
Annual fixed leasehold rent 296,875olp_OperatingLeasesAnnualFixedRent    
Annual fixed leasehold rent for next five years 371,094olp_OperatingLeasesAnnualFixedRentForNextFiveYears    
Annual fixed leasehold rent thereafter through March 3, 2020 $ 463,867olp_OperatingLeasesAnnualFixedRentThereafter    
Number of 5-year extension options 5olp_OperatingLeasesNumberOfFiveYearExtensionOptions    
Lease extension period for the first five renewal options 5 years    
Number of seven month extension options 1olp_OperatingLeasesNumberOfSevenMonthsExtensionOptions    
Lease extension period for the last renewal option 7 months