{"transactions":[{"id":699708,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2026-07-31T22:08:19.000Z","date":"2026-07-30","kind":"sale","planned":false,"acquired":false,"shares":4200,"price":32.08,"value":134736.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $31.98 to $32.14. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a securityholder 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 27,000 shares held by the reporting person's investment retirement account."}],"balance_after":77139,"source":{"system":"sec-edgar","filing":"0001437749-26-025258","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774926025258/rdgdoc.xml","form_type":"4"}},{"id":818899,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2026-04-02T20:06:45.000Z","date":"2026-03-31","kind":"tax_withholding","planned":false,"acquired":false,"shares":1324,"price":27.04,"value":35800.96,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 27,000 shares held by the reporting person's investment retirement account."}],"balance_after":81339,"source":{"system":"sec-edgar","filing":"0001437749-26-011111","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774926011111/rdgdoc.xml","form_type":"4"}},{"id":865105,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"Restricted Stock Units","published_at":"2026-03-03T23:50:30.000Z","date":"2026-03-02","kind":"grant","planned":false,"acquired":true,"shares":5740,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Reflects the grant of 5,740 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 1,913 shares will vest on March 2, 2027, 1,913 shares will vest on March 2, 2028, and the remaining 1,914 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":"price","element":"transactionPricePerShare","label":"F4","text":"Reflects the grant of 5,740 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 1,913 shares will vest on March 2, 2027, 1,913 shares will vest on March 2, 2028, and the remaining 1,914 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 5,740 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 1,913 shares will vest on March 2, 2027, 1,913 shares will vest on March 2, 2028, and the remaining 1,914 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 5,740 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 1,913 shares will vest on March 2, 2027, 1,913 shares will vest on March 2, 2028, and the remaining 1,914 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) 3,722 time-based restricted stock units granted to the reporting person on December 12, 2024, which will vest in two substantially equal installments on the second and third anniversary of the issuance date; (b) 3,912 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) 5,740 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 issuance date."}],"balance_after":13374,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":5740},"source":{"system":"sec-edgar","filing":"0001437749-26-006726","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774926006726/rdgdoc.xml","form_type":"4"}},{"id":865104,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"Restricted Stock Units","published_at":"2026-03-03T23:50:30.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":false,"shares":1926,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reporting person received an award of 5,838 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 5,838 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 5,838 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 5,838 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":7634,"derivative":{"underlying":"Common Stock","underlying_shares":1926},"source":{"system":"sec-edgar","filing":"0001437749-26-006726","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774926006726/rdgdoc.xml","form_type":"4"}},{"id":865103,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2026-03-03T23:50:30.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":676,"price":27.3,"value":18454.8,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 3,776 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 27,000 shares held by the reporting person's investment retirement account."}],"balance_after":82663,"source":{"system":"sec-edgar","filing":"0001437749-26-006726","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774926006726/rdgdoc.xml","form_type":"4"}},{"id":865102,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2026-03-03T23:50:30.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":true,"shares":1926,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person received an award of 5,838 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 3,776 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 27,000 shares held by the reporting person's investment retirement account."}],"balance_after":83339,"source":{"system":"sec-edgar","filing":"0001437749-26-006726","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774926006726/rdgdoc.xml","form_type":"4"}},{"id":967057,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"Restricted Stock Units","published_at":"2025-12-16T22:42:15.000Z","date":"2025-12-12","kind":"exercise","planned":false,"acquired":false,"shares":1833,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reporting person received an award of 5,555 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 5,555 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 5,555 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 5,555 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) 3,722 time-based restricted stock units granted on December 12, 2024, 1,833 shares will vest on December 12, 2026 and the remaining 1,889 shares will vest on December 12, 2027; and (b) 5,838 time-based restricted stock units granted to the reporting person on March 1, 2025, of which 1,926 shares will vest on March 1, 2026, 1,926 shares will vest on March 1, 2027, and the remaining 1,986 shares will vest on March 1, 2028."}],"balance_after":9560,"derivative":{"underlying":"Common Stock","underlying_shares":1833},"source":{"system":"sec-edgar","filing":"0001437749-25-038056","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774925038056/rdgdoc.xml","form_type":"4"}},{"id":967056,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2025-12-16T22:42:15.000Z","date":"2025-12-12","kind":"tax_withholding","planned":false,"acquired":false,"shares":643,"price":27.71,"value":17817.53,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 3,776 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 27,000 shares held by the reporting person's investment retirement account."}],"balance_after":82056,"source":{"system":"sec-edgar","filing":"0001437749-25-038056","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774925038056/rdgdoc.xml","form_type":"4"}},{"id":967055,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2025-12-16T22:42:15.000Z","date":"2025-12-12","kind":"exercise","planned":false,"acquired":true,"shares":1833,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person received an award of 5,555 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 3,776 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 27,000 shares held by the reporting person's investment retirement account."}],"balance_after":82056,"source":{"system":"sec-edgar","filing":"0001437749-25-038056","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774925038056/rdgdoc.xml","form_type":"4"}},{"id":1182504,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2025-04-02T22:15:57.000Z","date":"2025-03-31","kind":"tax_withholding","planned":false,"acquired":false,"shares":3140,"price":24.35,"value":76459.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 3,776 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 27,000 shares held by the Reporting Person's investment retirement account."}],"balance_after":80223,"source":{"system":"sec-edgar","filing":"0001437749-25-010770","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774925010770/rdgdoc.xml","form_type":"4"}},{"id":1196762,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"Restricted Stock Units","published_at":"2025-03-19T20:14:32.000Z","date":"2024-12-12","kind":"grant","planned":false,"acquired":true,"shares":5555,"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 5,555 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 5,555 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 5,555 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":5555,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":5555},"source":{"system":"sec-edgar","filing":"0001437749-25-008431","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774925008431/rdgdoc.xml","form_type":"4/A","original_submission_date":"2024-12-16"}},{"id":1221617,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"Restricted Stock Units","published_at":"2025-03-05T11:15:13.000Z","date":"2025-03-01","kind":"grant","planned":false,"acquired":true,"shares":5838,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Reflects the grant of 5,838 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,926 shares will vest on March 1, 2026, 1,926 shares will vest on March 1, 2027, and the remaining 1,986 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 5,838 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,926 shares will vest on March 1, 2026, 1,926 shares will vest on March 1, 2027, and the remaining 1,986 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 5,838 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,926 shares will vest on March 1, 2026, 1,926 shares will vest on March 1, 2027, and the remaining 1,986 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 5,838 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,926 shares will vest on March 1, 2026, 1,926 shares will vest on March 1, 2027, and the remaining 1,986 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 5,838 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,926 shares will vest on March 1, 2026, 1,926 shares will vest on March 1, 2027, and the remaining 1,986 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) 5,555 time-based restricted stock units granted on December 12, 2024, of which 1,833 shares will vest on December 12, 2025, 1,833 shares will vest on December 12, 2026, and the remaining 1,889 shares will vest on December 12, 2027; and (b) 5,838 time-based restricted stock units granted to the Reporting Person on March 1, 2025, of which 1,926 shares will vest on March 1, 2026, 1,926 shares will vest on March 1, 2027, and the remaining 1,986 shares will vest on March 1, 2028."}],"balance_after":11393,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":5838},"source":{"system":"sec-edgar","filing":"0001437749-25-006208","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774925006208/rdgdoc.xml","form_type":"4"}},{"id":1330469,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2024-12-16T21:08:30.000Z","date":"2024-12-12","kind":"grant","planned":false,"acquired":true,"shares":5555,"price":28.5,"value":158317.5,"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 (a) 5,500 shares of unvested restricted stock granted on 2/1/2023 which will vest on 3/31/2025; (b) 7,442 shares of unvested restricted stock granted on 2/1/2024, of which 3,666 shares will vest on 3/31/2025, and the remaining 3,776 shares will vest on 3/31/2026; and (c) 5,555 shares of unvested restricted stock granted on 12/12/2024, of which 1,833 shares will vest on 12/12/2025, 1,833 shares will vest on 12/12/2026, and the remaining 1,889 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 5,000 shares of the issuer's common stock held by reporting person's IRA."}],"balance_after":88918,"source":{"system":"sec-edgar","filing":"0001437749-24-037590","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774924037590/rdgdoc.xml","form_type":"4"}},{"id":1444075,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"STOCK OPTIONS (RIGHT TO BUY)","published_at":"2024-08-01T20:21:09.000Z","date":"2024-07-30","kind":"exercise","planned":false,"acquired":false,"shares":40000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Stock Options (Right to Buy) vested in four equal installments beginning on the grant date, June 2, 2016, and ending June 2, 2019."}],"balance_after":0,"derivative":{"exercise_price":17.65,"expiration_date":"2026-06-02","underlying":"Common Stock","underlying_shares":40000},"source":{"system":"sec-edgar","filing":"0001437749-24-024299","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774924024299/rdgdoc.xml","form_type":"4"}},{"id":1444074,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2024-08-01T20:21:09.000Z","date":"2024-07-30","kind":"tax_withholding","planned":false,"acquired":false,"shares":28534,"price":26.22,"value":748161.48,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 5,500 shares of unvested restricted stock granted on 2/1/2023 which will vest on 3/31/2025, and (b) 7,442 shares of unvested restricted stock granted on 2/1/2024, of which 3,666 shares will vest on 3/31/2025, and the remaining 3,776 shares will vest on 3/31/2026. 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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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":111897,"source":{"system":"sec-edgar","filing":"0001437749-24-024299","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774924024299/rdgdoc.xml","form_type":"4"}},{"id":1552679,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2024-04-02T20:29:32.000Z","date":"2024-03-31","kind":"tax_withholding","planned":false,"acquired":false,"shares":3438,"price":22.28,"value":76598.64,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 5,500 shares of unvested restricted stock granted on 2/1/2023 which will vest on 3/31/2025, and (b) 7,442 shares of unvested restricted stock granted on 2/1/2024, of which 3,666 shares will vest on 3/31/2025, and the remaining 3,776 shares will vest on 3/31/2026. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":71897,"source":{"system":"sec-edgar","filing":"0001437749-24-010617","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774924010617/rdgdoc.xml","form_type":"4"}},{"id":1660709,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2024-02-02T22:08:18.000Z","date":"2024-02-01","kind":"grant","planned":false,"acquired":true,"shares":11108,"price":22.48,"value":249707.84,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 3,116 shares of unvested restricted stock granted on 2/1/2022, which will vest on 3/31/2024, (b) 10,838 shares of unvested restricted stock granted on 2/1/2023, of which 5,338 shares will vest on 3/31/2024 and the remaining 5,500 shares will vest on 3/31/2025, and (c) 11,108 shares of unvested restricted stock granted on 2/1/2024, of which 3,666 shares will vest on 3/31/2024, 3,666 shares will vest on 3/31/2025, and the remaining 3,776 shares will vest on 3/31/2026. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":75335,"source":{"system":"sec-edgar","filing":"0001437749-24-002981","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774924002981/rdgdoc.xml","form_type":"4"}},{"id":1896355,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2023-05-11T17:01:20.000Z","date":"2023-05-03","kind":"purchase","planned":false,"acquired":true,"shares":1500,"price":14.6,"value":21900.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.56 to $14.60, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or Commission staff, upon request, full information regarding the number of shares sold at each separate price within this range."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F5","text":"The original Form 4, filed on May 5, 2023, is being amended solely to correct an administrative error, which inadvertently reported these purchases as dispositions of shares in column 4 rather than acquisitions of shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 3,116 shares of unvested restricted stock granted on 2/1/2022, which will vest on 3/31/2024, and (b) 10,838 shares of restricted stock granted on 2/1/2023, of which 5,338 shares will vest on 3/31/2024 and the remaining 5,500 shares will vest on 3/31/2025. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":64227,"source":{"system":"sec-edgar","filing":"0001437749-23-013836","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774923013836/rdgdoc.xml","form_type":"4/A","original_submission_date":"2023-05-05"}},{"id":1896354,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2023-05-11T17:01:20.000Z","date":"2023-05-02","kind":"purchase","planned":false,"acquired":true,"shares":8500,"price":14.59,"value":124015.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.55 to $14.60, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or Commission staff, upon request, full information regarding the number of shares sold at each separate price within this range."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F5","text":"The original Form 4, filed on May 5, 2023, is being amended solely to correct an administrative error, which inadvertently reported these purchases as dispositions of shares in column 4 rather than acquisitions of shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 3,116 shares of unvested restricted stock granted on 2/1/2022, which will vest on 3/31/2024, and (b) 10,838 shares of restricted stock granted on 2/1/2023, of which 5,338 shares will vest on 3/31/2024 and the remaining 5,500 shares will vest on 3/31/2025. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":62727,"source":{"system":"sec-edgar","filing":"0001437749-23-013836","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774923013836/rdgdoc.xml","form_type":"4/A","original_submission_date":"2023-05-05"}},{"id":1902196,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2023-05-05T20:47:48.000Z","date":"2023-05-03","kind":"purchase","planned":false,"acquired":false,"shares":1500,"price":14.6,"value":21900.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.56 to $14.60, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or Commission staff, upon request, full information regarding the number of shares sold at each separate price within this range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 3,116 shares of unvested restricted stock granted on 2/1/2022, which will vest on 3/31/2024, and (b) 10,838 shares of restricted stock granted on 2/1/2023, of which 5,338 shares will vest on 3/31/2024 and the remaining 5,500 shares will vest on 3/31/2025. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":64227,"source":{"system":"sec-edgar","filing":"0001437749-23-012840","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774923012840/rdgdoc.xml","form_type":"4"}},{"id":1902195,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2023-05-05T20:47:48.000Z","date":"2023-05-02","kind":"purchase","planned":false,"acquired":false,"shares":8500,"price":14.59,"value":124015.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.55 to $14.60, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or Commission staff, upon request, full information regarding the number of shares sold at each separate price within this range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 3,116 shares of unvested restricted stock granted on 2/1/2022, which will vest on 3/31/2024, and (b) 10,838 shares of restricted stock granted on 2/1/2023, of which 5,338 shares will vest on 3/31/2024 and the remaining 5,500 shares will vest on 3/31/2025. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":62727,"source":{"system":"sec-edgar","filing":"0001437749-23-012840","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774923012840/rdgdoc.xml","form_type":"4"}},{"id":1926710,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2023-04-04T20:19:16.000Z","date":"2023-03-31","kind":"tax_withholding","planned":false,"acquired":false,"shares":3577,"price":17.13,"value":61274.01,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 3,116 shares of unvested restricted stock granted on 2/1/2022, which will vest on 3/31/2024, and (b) 10,838 shares of restricted stock granted on 2/1/2023, of which 5,338 shares will vest on 3/31/2024 and the remaining 5,500 shares will vest on 3/31/2025. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":54227,"source":{"system":"sec-edgar","filing":"0001437749-23-009302","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774923009302/rdgdoc.xml","form_type":"4"}},{"id":2032059,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2023-02-03T22:31:53.000Z","date":"2023-02-01","kind":"grant","acquired":true,"shares":16176,"price":20.74,"value":335490.24,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Reflects the grant of restricted stock to reporting person. The terms of the restricted stock grant are described in footnote 2 below."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) 3,732 shares of unvested restricted stock granted on 2/1/2021, which will vest on 3/31/2023, (b) 6,230 shares of unvested restricted stock granted on 2/1/2022, of which 3,114 shares will vest on 3/31/2023, and the remaining 3,116 shares will vest on 3/31/2024, and (c) 16,176 shares of restricted stock granted on 2/1/2023, of which 5,338 shares will vest on 3/31/2023, 5,338 shares will vest on 3/31/2024, and the remaining 5,500 shares will vest on 3/31/2025. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":57804,"source":{"system":"sec-edgar","filing":"0001437749-23-002497","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774923002497/rdgdoc.xml","form_type":"4"}},{"id":2307124,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"Common Stock","published_at":"2022-04-04T22:40:28.000Z","date":"2022-03-31","kind":"tax_withholding","acquired":false,"shares":2528,"price":24.33,"value":61506.24,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 3,732 shares of unvested restricted stock granted on 2/1/2021, which will vest on 3/31/2023, and (b) 6,230 shares of unvested restricted stock granted on 2/1/2022, of which 3,114 shares will vest on 3/31/2023, and the remaining 3,116 shares will vest on 3/31/2024. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":41628,"source":{"system":"sec-edgar","filing":"0001437749-22-008229","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774922008229/rdgdoc.xml","form_type":"4"}},{"id":2412870,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"Common Stock","published_at":"2022-02-03T21:03:43.000Z","date":"2022-02-01","kind":"grant","acquired":true,"shares":9344,"price":27.13,"value":253502.72,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Reflects the grant of restricted stock to reporting person. The terms of the restricted stock grant are described in footnote 2 below."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) 1,871 shares of unvested restricted stock granted on 2/1/2020, which will vest on 3/31/2022, (b) 7,355 shares of unvested restricted stock granted on 2/1/2021, 3,623 shares of which will vest on 3/31/2022 and the remaining 3,732 shares will vest on 3/31/2023, and (c) 9,344 shares of unvested restricted stock granted on 2/1/2022, of which 3,084 shares will vest on 3/31/2022, 3,084 shares will vest on 3/31/2023, and the remaining 3,176 shares will vest on 3/31/2024. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":44156,"source":{"system":"sec-edgar","filing":"0001437749-22-002368","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774922002368/rdgdoc.xml","form_type":"4"}},{"id":2601834,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"Common Stock","published_at":"2021-08-16T23:25:47.000Z","date":"2021-03-31","kind":"tax_withholding","acquired":false,"shares":1790,"price":23.93,"value":42834.7,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 1,871 shares of unvested restricted stock granted on 2/1/2020, which will vest on 3/31/2022, and (c) 7,355 shares of unvested restricted stock granted on 2/1/2021, 3,623 shares of which will vest on 3/31/2022 and the remaining 3,732 shares will vest on 3/31/2023.  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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":34812,"source":{"system":"sec-edgar","filing":"0001437749-21-020234","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774921020234/rdgdoc.xml","form_type":"4"}},{"id":2805177,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2021-03-05T19:45:06.000Z","date":"2021-02-01","kind":"grant","acquired":true,"shares":10978,"price":20.7,"value":227244.6,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Reflects the grant of restricted stock to reporting person. The terms of the restricted stock grant are described in footnote 2 below."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) 656 shares of unvested restricted stock granted on 03/31/2019, all of which will vest on 3/31/2021, (b) 3,687 shares of unvested restricted stock granted on 2/1/2020, which will vest in two equal installments on 3/31/2021 and 3/31/2022, and (c) 10,978 shares of unvested restricted stock granted on 2/1/2021, 3,623 shares of which will vest on each of 3/31/2021 and 3/31/2022 and the remaining 3,733 shares will vest on 3/31/2023.  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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":36614,"source":{"system":"sec-edgar","filing":"0001437749-21-005127","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774921005127/rdgdoc.xml","form_type":"4/A","original_submission_date":"2021-02-03"}},{"id":2880715,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2021-02-04T02:36:41.000Z","date":"2020-02-01","kind":"grant","acquired":true,"shares":10978,"price":20.7,"value":227244.6,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Reflects the grant of restricted stock to reporting person. The terms of the restricted stock grant are described in footnote 2 below."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) 656 shares of unvested restricted stock granted on 03/31/2019, all of which will vest on 3/31/2021, (b) 3,687 shares of unvested restricted stock granted on 2/1/2020, which will vest in two equal installments on 3/31/2021 and 3/31/2022, and (c) 10,978 shares of unvested restricted stock granted on 2/1/2021, 3,623 shares of which will vest on each of 3/31/2021 and 3/31/2022 and the remaining 3,733 shares will vest on 3/31/2023.  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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":36614,"source":{"system":"sec-edgar","filing":"0001437749-21-001928","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774921001928/rdgdoc.xml","form_type":"4"}},{"id":3185726,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"Common Stock","published_at":"2020-04-03T01:33:26.000Z","date":"2020-03-31","kind":"tax_withholding","acquired":false,"shares":1472,"price":13.5,"value":19872.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) 656 shares of unvested restricted stock granted on 03/31/2019, all of which will vest on 3/31/2021, and (b) 3,687 shares of unvested restricted stock granted on 2/1/2020, which will vest in two equal installments on 3/31/2021 and 3/31/2022.  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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 5,000 shares held by reporting person's IRA."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 2,000 shares acquired on 3/12/2020 and reported on a Form 4 filed on 3/13/2020."}],"balance_after":25126,"source":{"system":"sec-edgar","filing":"0001437749-20-007009","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774920007009/rdgdoc.xml","form_type":"4"}},{"id":3185725,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"Common Stock","published_at":"2020-04-03T01:33:26.000Z","date":"2020-02-01","kind":"grant","acquired":true,"shares":5503,"price":24.78,"value":136364.34,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Reflects the grant of restricted stock to reporting person. The terms of the restricted stock grant are described in footnote 2 below."}],"balance_after":24598,"source":{"system":"sec-edgar","filing":"0001437749-20-007009","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774920007009/rdgdoc.xml","form_type":"4"}},{"id":3210361,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of b1Bank"}}],"security":"COMMON STOCK","published_at":"2020-03-14T00:29:32.000Z","date":"2020-03-12","kind":"purchase","acquired":true,"shares":2000,"price":15.85,"value":31700.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $15.845 to $15,8478. The price reported above reflect the weighted average sale 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 (a) 755 shares of unvested restricted stock granted on 03/31/2018 and (b) 1,292 shares of unvested restricted stock granted on 03/31/2019, in each case subject to vesting in three equal installments over a period of two years beginning on the grant date and subject to the terms of the relevant restricted stock grant. The reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events specified in the restricted stock grant."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":21095,"source":{"system":"sec-edgar","filing":"0001437749-20-005209","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774920005209/rdgdoc.xml","form_type":"4"}},{"id":3397919,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of Business First Bank"}}],"security":"COMMON STOCK","published_at":"2019-10-03T21:44:53.000Z","date":"2019-03-31","kind":"tax_withholding","acquired":false,"shares":473,"price":24.54,"value":11607.42,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) 755 shares of unvested restricted stock granted on 03/31/2018 and (b) 1,292 shares of unvested restricted stock granted on 03/31/2019, in each case subject to vesting in three equal installments over a period of two years beginning on the grant date and subject to the terms of the relevant restricted stock grant. The reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events specified in the restricted stock grant."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":19095,"source":{"system":"sec-edgar","filing":"0001437749-19-019638","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774919019638/rdgdoc.xml","form_type":"4"}},{"id":3397918,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of Business First Bank"}}],"security":"COMMON STOCK","published_at":"2019-10-03T21:44:53.000Z","date":"2019-03-31","kind":"grant","acquired":true,"shares":1927,"price":23.74,"value":45746.98,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Reflects the grant of 1,927 shares of restricted stock to reporting person, 635 of which vested upon the grant date. The terms of the restricted stock grant are described in footnote 2 below."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) 755 shares of unvested restricted stock granted on 03/31/2018 and (b) 1,292 shares of unvested restricted stock granted on 03/31/2019, in each case subject to vesting in three equal installments over a period of two years beginning on the grant date and subject to the terms of the relevant restricted stock grant. The reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events specified in the restricted stock grant."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":19568,"source":{"system":"sec-edgar","filing":"0001437749-19-019638","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774919019638/rdgdoc.xml","form_type":"4"}},{"id":3890255,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of Business First Bank"}}],"security":"COMMON STOCK","published_at":"2018-06-18T20:45:57.000Z","date":"2018-06-14","kind":"purchase","acquired":true,"shares":8000,"price":25.05,"value":200400.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 233 shares of unvested restricted stock granted on 3/31/2017 and (b) 1,488 shares of unvested restricted stock granted on 3/31/2018, in each case subject to vesting in three equal installments over a period of two years beginning on the grant date and subject to the terms of the relevant restricted stock grant.  The reported shares of unvested stock are subject to forfeiture upon the occurrence of certain events specified in the restricted stock grant."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":17641,"source":{"system":"sec-edgar","filing":"0001437749-18-012017","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774918012017/rdgdoc.xml","form_type":"4/A","original_submission_date":"2018-06-14"}},{"id":3890254,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of Business First Bank"}}],"security":"COMMON STOCK","published_at":"2018-06-18T20:45:57.000Z","date":"2018-06-13","kind":"purchase","acquired":true,"shares":2000,"price":25.12,"value":50240.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 233 shares of unvested restricted stock granted on 3/31/2017 and (b) 1,488 shares of unvested restricted stock granted on 3/31/2018, in each case subject to vesting in three equal installments over a period of two years beginning on the grant date and subject to the terms of the relevant restricted stock grant.  The reported shares of unvested stock are subject to forfeiture upon the occurrence of certain events specified in the restricted stock grant."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":9641,"source":{"system":"sec-edgar","filing":"0001437749-18-012017","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774918012017/rdgdoc.xml","form_type":"4/A","original_submission_date":"2018-06-14"}},{"id":3893386,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":27444,"kind":"person","name":"MANSFIELD KEITH","position":1,"cik":"0001734773","reported_name":"MANSFIELD KEITH","relationship":{"officer":true,"officer_title":"EVP&COO of Business First Bank"}}],"security":"COMMON STOCK","published_at":"2018-06-14T20:15:25.000Z","date":"2018-06-14","kind":"purchase","acquired":true,"shares":8000,"price":25.05,"value":200400.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (a) 233 shares of unvested restricted stock granted on 3/31/2017 and (b) 1,488 shares of unvested restricted stock granted on 3/31/2018, in each case subject to vesting in three equal installments over a period of two years beginning on the grant date and subject to the terms of the relevant restricted stock grant.  The reported shares of unvested stock are subject to forfeiture upon the occurrence of certain events specified in the restricted stock grant."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,000 shares held by reporting person's IRA."}],"balance_after":15641,"source":{"system":"sec-edgar","filing":"0001437749-18-011831","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774918011831/rdgdoc.xml","form_type":"4"}}]}