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Cover
Jun. 30, 2020
Cover [Abstract]  
Document Type 8-K/A
Amendment Flag true
Amendment Description We are filing this amendment to the Current Report on Form 8-K that  we  filed on July 7, 2020 (the “Original Report”), (i) in furtherance of our statement therein that we would file an amendment to the Original Report when our Charter was accepted for filing with the SDAT and (ii) to refile the Charter as an exhibit to reflect ministerial changes to the charter filed with the Original Report. There are no other changes to the Original Report. (There are no changes to the Amended and Restated Bylaws which are refiled herewith for the convenience of investors). Capitalized terms used without being defined herein have the meanings ascribed to such terms by the Original Report.
Document Period End Date Jun. 30, 2020
Current Fiscal Year End Date --12-31
Entity File Number 001-09279
Entity Registrant Name ONE LIBERTY PROPERTIES, INC.
Entity Central Index Key 0000712770
Entity Tax Identification Number 13-3147497
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One 60 Cutter Mill Road
Entity Address, Address Line Two Suite 303
Entity Address, City or Town Great Neck
Entity Address, State or Province NY
Entity Address, Postal Zip Code 11021
City Area Code (516)
Local Phone Number 466-3100
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol OLP
Security Exchange Name NYSE
Entity Emerging Growth Company false