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LEASES - As Lessee - Ground Lease and Office Lease (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Lessee Accounting    
Operating lease liability $ 7,497,000  
Operating lease liability, Statement of Financial Position us-gaap:AccruedLiabilitiesCurrentAndNoncurrent  
Operating lease, right-of-use asset, Statement of Financial Position olp:EscrowDepositsAndOtherAssetsAndReceivables  
Five-Year Lease    
Lessee Accounting    
Operating lease, number of renewal options | item 4  
Operating lease, renewal term 5 years  
Seven-Month Lease    
Lessee Accounting    
Operating lease, number of renewal options | item 1  
Operating lease, renewal term 7 months  
Operating lease, option to extend true  
Real Estate in Greensboro, NC    
Lessee Accounting    
Operating lease liability $ 6,895,000  
Right-of-use asset $ 6,663,000  
Operating lease, discount rate (as a percent) 2.95%  
Operating lease, remaining lease term 14 years 2 months 12 days  
Operating lease expense $ 533,000 $ 525,000
Real Estate in Greensboro, NC | Five-Year Lease    
Lessee Accounting    
Operating lease, number of renewal options | item 4  
Operating lease, renewal term 5 years  
Operating lease, option to extend true  
Real Estate in Greensboro, NC | Seven-Month Lease    
Lessee Accounting    
Operating lease, number of renewal options | item 1  
Operating lease, renewal term 7 months  
Corporate office lease in Great Neck, NY    
Lessee Accounting    
Operating lease, renewal term 5 years  
Operating lease, option to extend true  
Operating lease liability $ 602,000  
Right-of-use asset $ 593,000  
Operating lease, discount rate (as a percent) 3.81%  
Operating lease, remaining lease term 16 years  
Operating lease expense $ 57,000 $ 54,000