v3.26.1
Cover
May 12, 2026
Document Type 8-K
Amendment Flag false
Document Period End Date May 12, 2026
Entity File Number 000-11676
Entity Registrant Name BEL FUSE INC /NJ
Entity Central Index Key 0000729580
Entity Tax Identification Number 22-1463699
Entity Incorporation, State or Country Code NJ
Entity Address, Address Line One 300 Executive Drive, Suite 300
Entity Address, City or Town West Orange
Entity Address, State or Province NJ
Entity Address, Postal Zip Code 07052
City Area Code 201
Local Phone Number 432-0463
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Class A Common Stock ($0.10 par value)  
Title of 12(b) Security Class A Common Stock ($0.10 par value)
Trading Symbol BELFA
Security Exchange Name NASDAQ
Class B Common Stock ($0.10 par value)  
Title of 12(b) Security Class B Common Stock ($0.10 par value)
Trading Symbol BELFB
Security Exchange Name NASDAQ