0001624322 2026-05-21 2026-05-21 false 0001624322 8-K 2026-05-21 BUSINESS FIRST BANCSHARES, INC. LA 001-38447 20-5340628 500 Laurel Street, Suite 101 Baton Rouge LA 70801 225 248-7600 false false false false Common Stock, par value $1.00 per share BFST NASDAQ false