v3.26.3
Form N-1A Cover
Oct. 26, 2026
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name BRUCE FUND, INC.
Document Effective Date Oct. 28, 2026
Entity Central Index Key 0000047071
Document Creation Date Oct. 26, 2026
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
Prospectus Date Oct. 28, 2026