Cover - shares	6 Months Ended
	Apr. 30, 2024	Jun. 14, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Period End Date	Apr. 30, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Entity Information [Line Items]
Entity Registrant Name	FIRST REAL ESTATE INVESTMENT TRUST OF NEW JERSEY, INC.
Entity Central Index Key	0000036840
Entity File Number	000-25043
Entity Tax Identification Number	22-1697095
Entity Incorporation, State or Country Code	MD
Current Fiscal Year End Date	--10-31
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Contact Personnel [Line Items]
Entity Address, Address Line One	505 Main Street, Suite 400
Entity Address, City or Town	Hackensack
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07601
Entity Phone Fax Numbers [Line Items]
City Area Code	(201)
Local Phone Number	488-6400
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		7,458,193
Common stock
Entity Listings [Line Items]
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	FREVS
Security Exchange Name	NONE
Preferred Stock
Entity Listings [Line Items]
Title of 12(b) Security	Preferred Stock Purchase Rights