v3.26.1
Cover Page - shares
 3 Months Ended
Jan. 31, 2026
Mar. 17, 2026
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 Jan. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
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 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  
City Area Code (201)  
Local Phone Number 488-6400  
Entity Common Stock, Shares Outstanding   7,482,432
Common stock, par value $0.01 per share    
Document Information [Line Items]    
Title of 12(b) Security Common stock, par value $0.01 per share  
Trading Symbol FREVS  
Security Exchange Name NONE  
Preferred Stock Purchase Rights    
Document Information [Line Items]    
Title of 12(b) Security Preferred Stock Purchase Rights (1)