Cover
| Cover | Jun. 14, 2024 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 14, 2024 |
| Entity File Number | 000-25043 |
| Entity Registrant Name | FIRST REAL ESTATE INVESTMENT TRUST OF NEW JERSEY, INC. |
| Entity Central Index Key | 0000036840 |
| Entity Tax Identification Number | 22-1697095 |
| Entity Incorporation, State or Country Code | MD |
| Entity Address, Address Line One | 505 Main Street |
| Entity Address, Address Line Two | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Title of 12(b) Security | Common stock, par value $0.01 per share |
| Trading Symbol | FREVS |
| Preferred Stock [Member] | |
| Title of 12(b) Security | Preferred Stock Purchase Rights |