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COVER PAGE - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Mar. 01, 2021
Jun. 28, 2020
Cover [Abstract]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 001-07172    
Entity Registrant Name BRT APARTMENTS CORP.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 13-2755856    
Entity Address, Address Line One 60 Cutter Mill Road    
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    
Title of 12(b) Security Shares of common stock, par value $.01 per share    
Trading Symbol BRT    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag false    
Entity Public Float     $ 113.0
Entity Common Stock, Shares Outstanding   17,333,175  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the proxy statement for the 2021 annual meeting of stockholders of the Registrant to be filed pursuant to Regulation 14A not later than April 30, 2021, are incorporated by reference into Part III of this Annual Report on Form 10-K.
    
Amendment Flag false    
Entity Central Index Key 0000014846    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY