Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2018	Feb. 02, 2019
Document and Entity Information
Entity Registrant Name	BRT APARTMENTS CORP.
Entity Central Index Key	0000014846
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding (in shares)		15,900,395