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Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Reflects the grant of 4,020 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 1,340 shares will vest on March 2, 2027, 1,340 shares will vest on March 2, 2028, and the remaining 1,340 shares will vest on March 2, 2029. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Reflects the grant of 4,020 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 1,340 shares will vest on March 2, 2027, 1,340 shares will vest on March 2, 2028, and the remaining 1,340 shares will vest on March 2, 2029. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Reflects the grant of 4,020 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 1,340 shares will vest on March 2, 2027, 1,340 shares will vest on March 2, 2028, and the remaining 1,340 shares will vest on March 2, 2029. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Includes: (a) 2,584 time-based restricted stock units granted on December 12, 2024, which will vest in two substantially equal installments on the second and third anniversary of the issuance date; (b) 2,715 time-based restricted stock units granted to the reporting person on March 1, 2025, which will vest in two substantially equal installments on the second and third anniversary of the issuance date; and (c) 4,020 time-based restricted stock units granted to the reporting person on March 2, 2026, which will vest in three substantially equal installments on the first, second, and third anniversary of the issue date."}],"balance_after":9319,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":4020},"source":{"system":"sec-edgar","filing":"0001437749-26-006723","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774926006723/rdgdoc.xml","form_type":"4"}},{"id":868723,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25503,"kind":"person","name":"Carter Donald Chad","position":1,"cik":"0002021584","reported_name":"Carter Donald Chad","relationship":{"officer":true,"officer_title":"EVP, Correspondent Banking"}}],"security":"Restricted Stock Units","published_at":"2026-03-03T23:49:09.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":false,"shares":1337,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reporting person received an award of 4,052 time-based restricted stock units on March 1, 2025, vesting in three substantially equal installments on the first, second, and third anniversary of the issuance date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person received an award of 4,052 time-based restricted stock units on March 1, 2025, vesting in three substantially equal installments on the first, second, and third anniversary of the issuance date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person received an award of 4,052 time-based restricted stock units on March 1, 2025, vesting in three substantially equal installments on the first, second, and third anniversary of the issuance date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reporting person received an award of 4,052 time-based restricted stock units on March 1, 2025, vesting in three substantially equal installments on the first, second, and third anniversary of the issuance date."}],"balance_after":5299,"derivative":{"underlying":"Common Stock","underlying_shares":1337},"source":{"system":"sec-edgar","filing":"0001437749-26-006723","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774926006723/rdgdoc.xml","form_type":"4"}},{"id":868722,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25503,"kind":"person","name":"Carter Donald Chad","position":1,"cik":"0002021584","reported_name":"Carter Donald Chad","relationship":{"officer":true,"officer_title":"EVP, Correspondent Banking"}}],"security":"COMMON STOCK","published_at":"2026-03-03T23:49:09.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":366,"price":27.3,"value":9991.8,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes units of the employer stock fund through the issuer's 401(k) plan equivalent to 6,799 shares of common stock of the issuer."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,156 shares of unvested restricted stock granted on February 1, 2024, which will vest on March 31, 2026. Under the terms of the relevant restricted stock grants, the reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events."}],"balance_after":14834,"source":{"system":"sec-edgar","filing":"0001437749-26-006723","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774926006723/rdgdoc.xml","form_type":"4"}},{"id":868721,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25503,"kind":"person","name":"Carter Donald Chad","position":1,"cik":"0002021584","reported_name":"Carter Donald Chad","relationship":{"officer":true,"officer_title":"EVP, Correspondent Banking"}}],"security":"COMMON STOCK","published_at":"2026-03-03T23:49:09.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":true,"shares":1337,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person received an award of 4,052 time-based restricted stock units on March 1, 2025, vesting in three substantially equal installments on the first, second, and third anniversary of the issuance date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes units of the employer stock fund through the issuer's 401(k) plan equivalent to 6,799 shares of common stock of the issuer."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,156 shares of unvested restricted stock granted on February 1, 2024, which will vest on March 31, 2026. Under the terms of the relevant restricted stock grants, the reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events."}],"balance_after":15200,"source":{"system":"sec-edgar","filing":"0001437749-26-006723","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774926006723/rdgdoc.xml","form_type":"4"}},{"id":927217,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25503,"kind":"person","name":"Carter Donald Chad","position":1,"cik":"0002021584","reported_name":"Carter Donald Chad","relationship":{"officer":true,"officer_title":"EVP, Correspondent Banking"}}],"security":"COMMON STOCK","published_at":"2026-01-30T21:42:22.000Z","date":"2026-01-29","kind":"sale","planned":false,"acquired":false,"shares":3778,"price":27.27,"value":103026.06,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $27.27 to $27.28. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes units of the employer stock fund through the issuer's 401(k) plan equivalent to 6,799 shares of common stock of the issuer."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 1,156 shares of unvested restricted stock granted on February 1, 2024, which will vest on March 31, 2026. Under the terms of the relevant restricted stock grants, the reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events."}],"balance_after":13863,"source":{"system":"sec-edgar","filing":"0001437749-26-002572","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774926002572/rdgdoc.xml","form_type":"4"}},{"id":967914,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25503,"kind":"person","name":"Carter Donald Chad","position":1,"cik":"0002021584","reported_name":"Carter Donald Chad","relationship":{"officer":true,"officer_title":"EVP, Correspondent Banking"}}],"security":"Restricted Stock Units","published_at":"2025-12-16T22:41:56.000Z","date":"2025-12-12","kind":"exercise","planned":false,"acquired":false,"shares":1272,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reporting person received an award of 3,856 time-based restricted stock units on December 12, 2024, vesting in three substantially equal installments on the first, second, and third anniversary of the issuance date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person received an award of 3,856 time-based restricted stock units on December 12, 2024, vesting in three substantially equal installments on the first, second, and third anniversary of the issuance date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person received an award of 3,856 time-based restricted stock units on December 12, 2024, vesting in three substantially equal installments on the first, second, and third anniversary of the issuance date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reporting person received an award of 3,856 time-based restricted stock units on December 12, 2024, vesting in three substantially equal installments on the first, second, and third anniversary of the issuance date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes: (a) 2,584 time-based restricted stock units granted on December 12, 2024, of which 1,272 shares will vest on December 12, 2026 and the remaining 1,312 shares will vest on December 12, 2027; and (b) 4,052 time-based restricted stock units granted to the reporting person on March 1, 2025, of which 1,337 shares will vest on March 1, 2026, 1,337 shares will vest on March 1, 2027, and the remaining 1,378 shares will vest on March 1, 2028."}],"balance_after":6636,"derivative":{"underlying":"Common Stock","underlying_shares":1272},"source":{"system":"sec-edgar","filing":"0001437749-25-038055","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774925038055/rdgdoc.xml","form_type":"4"}},{"id":967913,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25503,"kind":"person","name":"Carter Donald Chad","position":1,"cik":"0002021584","reported_name":"Carter Donald Chad","relationship":{"officer":true,"officer_title":"EVP, Correspondent Banking"}}],"security":"COMMON STOCK","published_at":"2025-12-16T22:41:56.000Z","date":"2025-12-12","kind":"tax_withholding","planned":false,"acquired":false,"shares":348,"price":27.71,"value":9643.08,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes units of the employer stock fund through the issuer's 401(k) plan equivalent to 6,799 shares of common stock of the issuer."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,156 shares of unvested restricted stock granted on February 1, 2024, which will vest on March 31, 2026. Under the terms of the relevant restricted stock grants, the reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events."}],"balance_after":17641,"source":{"system":"sec-edgar","filing":"0001437749-25-038055","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774925038055/rdgdoc.xml","form_type":"4"}},{"id":967912,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25503,"kind":"person","name":"Carter Donald Chad","position":1,"cik":"0002021584","reported_name":"Carter Donald Chad","relationship":{"officer":true,"officer_title":"EVP, Correspondent Banking"}}],"security":"COMMON STOCK","published_at":"2025-12-16T22:41:56.000Z","date":"2025-12-12","kind":"exercise","planned":false,"acquired":true,"shares":1272,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person received an award of 3,856 time-based restricted stock units on December 12, 2024, vesting in three substantially equal installments on the first, second, and third anniversary of the issuance date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes units of the employer stock fund through the issuer's 401(k) plan equivalent to 6,799 shares of common stock of the issuer."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,156 shares of unvested restricted stock granted on February 1, 2024, which will vest on March 31, 2026. Under the terms of the relevant restricted stock grants, the reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events."}],"balance_after":17989,"source":{"system":"sec-edgar","filing":"0001437749-25-038055","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774925038055/rdgdoc.xml","form_type":"4"}},{"id":1184048,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25503,"kind":"person","name":"Carter Donald Chad","position":1,"cik":"0002021584","reported_name":"Carter Donald Chad","relationship":{"officer":true,"officer_title":"EVP, Correspondent Banking"}}],"security":"COMMON STOCK","published_at":"2025-04-02T22:12:54.000Z","date":"2025-03-31","kind":"tax_withholding","planned":false,"acquired":false,"shares":506,"price":24.35,"value":12321.1,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes units of the employer stock fund through the issuer's 401(k) plan equivalent to 6,799 shares of common stock of the issuer."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,156 shares of unvested restricted stock granted on February 1, 2024, which will vest on March 31, 2026. Under the terms of the relevant restricted stock grants, the reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events."}],"balance_after":16717,"source":{"system":"sec-edgar","filing":"0001437749-25-010765","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774925010765/rdgdoc.xml","form_type":"4"}},{"id":1197393,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25503,"kind":"person","name":"Carter Donald Chad","position":1,"cik":"0002021584","reported_name":"Carter Donald Chad","relationship":{"officer":true,"officer_title":"EVP, Correspondent Banking"}}],"security":"Restricted Stock Units","published_at":"2025-03-19T20:15:54.000Z","date":"2024-12-12","kind":"grant","planned":false,"acquired":true,"shares":3856,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F4","text":"The original Form 4, filed on December 16, 2024, incorrectly reported the grant of the reported securities as an acquisition of shares of restricted stock under Table I. This amendment is being filed to correct the original report by reporting the grant of the reported securities as an acquisition of restricted stock units under Table II."},{"field":"shares","element":"transactionShares","label":"F5","text":"Reflects the grant of 3,856 time-based restricted stock units granted to the reporting person under the Business First Bancshares, Inc. 2024 Equity Incentive Plan on December 12, 2024. The time-based restricted stock units will vest in three substantially equal installments on the first, second and third anniversary of the issuance date. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer. Under the terms of the relevant restricted stock unit grant, the reported unvested restricted stock units are subject to forfeiture upon the occurrence of certain events."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Reflects the grant of 3,856 time-based restricted stock units granted to the reporting person under the Business First Bancshares, Inc. 2024 Equity Incentive Plan on December 12, 2024. The time-based restricted stock units will vest in three substantially equal installments on the first, second and third anniversary of the issuance date. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer. Under the terms of the relevant restricted stock unit grant, the reported unvested restricted stock units are subject to forfeiture upon the occurrence of certain events."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Reflects the grant of 3,856 time-based restricted stock units granted to the reporting person under the Business First Bancshares, Inc. 2024 Equity Incentive Plan on December 12, 2024. The time-based restricted stock units will vest in three substantially equal installments on the first, second and third anniversary of the issuance date. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer. Under the terms of the relevant restricted stock unit grant, the reported unvested restricted stock units are subject to forfeiture upon the occurrence of certain events."}],"balance_after":3856,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":3856},"source":{"system":"sec-edgar","filing":"0001437749-25-008435","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774925008435/rdgdoc.xml","form_type":"4/A","original_submission_date":"2024-12-16"}},{"id":1223197,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25503,"kind":"person","name":"Carter Donald Chad","position":1,"cik":"0002021584","reported_name":"Carter Donald Chad","relationship":{"officer":true,"officer_title":"EVP, Correspondent Banking"}}],"security":"Restricted Stock Units","published_at":"2025-03-05T11:22:00.000Z","date":"2025-03-01","kind":"grant","planned":false,"acquired":true,"shares":4052,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Reflects the grant of 4,052 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,337 shares will vest on March 1, 2026, 1,337 shares will vest on March 1, 2027, and the remaining 1,378 shares will vest on March 1, 2028. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Reflects the grant of 4,052 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,337 shares will vest on March 1, 2026, 1,337 shares will vest on March 1, 2027, and the remaining 1,378 shares will vest on March 1, 2028. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Reflects the grant of 4,052 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,337 shares will vest on March 1, 2026, 1,337 shares will vest on March 1, 2027, and the remaining 1,378 shares will vest on March 1, 2028. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Reflects the grant of 4,052 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,337 shares will vest on March 1, 2026, 1,337 shares will vest on March 1, 2027, and the remaining 1,378 shares will vest on March 1, 2028. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F4","text":"Reflects the grant of 4,052 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,337 shares will vest on March 1, 2026, 1,337 shares will vest on March 1, 2027, and the remaining 1,378 shares will vest on March 1, 2028. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Includes: (a) 3,856 time-based restricted stock units granted on December 12, 2024, of which 1,272 shares will vest on December 12, 2025, 1,272 shares will vest on December 12, 2026, and the remaining 1,312 shares will vest on December 12, 2027; and (b) 4,052 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,337 shares will vest on March 1, 2026, 1,337 shares will vest on March 1, 2027, and the remaining 1,378 shares will vest on March 1, 2028."}],"balance_after":7908,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":4052},"source":{"system":"sec-edgar","filing":"0001437749-25-006212","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774925006212/rdgdoc.xml","form_type":"4"}},{"id":1331099,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25503,"kind":"person","name":"Carter Donald Chad","position":1,"cik":"0002021584","reported_name":"Carter Donald Chad","relationship":{"officer":true,"officer_title":"EVP, Correspondent Banking"}}],"security":"COMMON STOCK","published_at":"2024-12-16T21:10:03.000Z","date":"2024-12-12","kind":"grant","planned":false,"acquired":true,"shares":3856,"price":28.5,"value":109896.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Reflects the grant of time-based restricted stock to the reporting person. The time-based restricted stock will vest in substantially equal installments on the first, second, and third anniversary of the issuance date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes units of employer stock fund through issuer's 401(k) plan equivalent to 6,799 shares of common stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes (a) 3,068 shares of unvested restricted stock granted on 2/1/2024, of which 1,912 shares will vest on 3/31/2025 and the remaining 1,156 shares will vest on 3/31/2026, and (b) 3,856 shares of unvested restricted stock granted on 12/12/2024, of which 1,272 shares will vest on 12/12/2025, 1,272 shares will vest on 12/12/2026, and the remaining 1,312 shares will vest on 12/12/2027. Under the terms of the relevant restricted stock grants, the reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events."}],"balance_after":21079,"source":{"system":"sec-edgar","filing":"0001437749-24-037594","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2021584/000143774924037594/rdgdoc.xml","form_type":"4"}}]}