| Cover | May 06, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 6, 2021 |
| Entity Registrant Name | BRT APARTMENTS CORP. |
| Amendment Flag | false |
| Entity Central Index Key | 0000014846 |
| Entity Incorporation, State or Country Code | MD |
| Entity File Number | 001-07172 |
| Entity Tax Identification Number | 13-2755856 |
| 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 | BRT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
