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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":"F4","text":"Reflects the grant of 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. 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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":"F3","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":"F3","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":"F3","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":"F3","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":"F4","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":"0001437749-25-006216","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774925006216/rdgdoc.xml","form_type":"4"}},{"id":1330474,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"EVP and CFO"}}],"security":"COMMON STOCK","published_at":"2024-12-16T21:11:40.000Z","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. 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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."}],"balance_after":72755,"source":{"system":"sec-edgar","filing":"0001437749-24-010612","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774924010612/rdgdoc.xml","form_type":"4"}},{"id":1660707,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"EVP and CFO"}}],"security":"COMMON STOCK","published_at":"2024-02-02T22:06:39.000Z","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. 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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."}],"balance_after":60501,"source":{"system":"sec-edgar","filing":"0001437749-23-014222","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774923014222/rdgdoc.xml","form_type":"4"}},{"id":1894654,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2023-05-12T20:05:26.000Z","date":"2023-05-04","kind":"other","planned":false,"acquired":true,"shares":511,"price":13.47,"value":6883.17,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.44 to $13.48, 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."}],"balance_after":53726,"source":{"system":"sec-edgar","filing":"0001437749-23-014222","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774923014222/rdgdoc.xml","form_type":"4"}},{"id":1926714,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"EVP and CFO"}}],"security":"COMMON STOCK","published_at":"2023-04-04T20:20:57.000Z","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":"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) 3,116 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."}],"balance_after":53215,"source":{"system":"sec-edgar","filing":"0001437749-23-009306","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774923009306/rdgdoc.xml","form_type":"4"}},{"id":2032056,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"EVP and CFO"}}],"security":"COMMON STOCK","published_at":"2023-02-03T22:30:40.000Z","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."}],"balance_after":56792,"source":{"system":"sec-edgar","filing":"0001437749-23-002495","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774923002495/rdgdoc.xml","form_type":"4"}},{"id":2307125,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2022-04-04T22:40:48.000Z","date":"2022-03-31","kind":"tax_withholding","acquired":false,"shares":2614,"price":24.33,"value":63598.62,"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."}],"balance_after":40616,"source":{"system":"sec-edgar","filing":"0001437749-22-008230","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774922008230/rdgdoc.xml","form_type":"4"}},{"id":2412873,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2022-02-03T21:04:37.000Z","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."}],"balance_after":43230,"source":{"system":"sec-edgar","filing":"0001437749-22-002370","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774922002370/rdgdoc.xml","form_type":"4"}},{"id":2558573,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"EVP and CFO"}}],"security":"Stock Options (Right to Buy)","published_at":"2021-09-27T21:58:32.000Z","date":"2021-09-23","kind":"exercise","acquired":false,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":15,"exercise_date":"2014-09-26","expiration_date":"2021-09-26","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001437749-21-022703","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774921022703/rdgdoc.xml","form_type":"4"}},{"id":2558572,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"EVP and CFO"}}],"security":"COMMON STOCK","published_at":"2021-09-27T21:58:32.000Z","date":"2021-09-23","kind":"tax_withholding","acquired":false,"shares":6497,"price":23.09,"value":150015.73,"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 (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. 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The terms of the restricted stock grant are described in footnote 2 below."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) 1,425 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."}],"balance_after":27356,"source":{"system":"sec-edgar","filing":"0001437749-21-005128","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774921005128/rdgdoc.xml","form_type":"4/A","original_submission_date":"2021-02-03"}},{"id":2880716,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"EVP and CFO"}}],"security":"COMMON STOCK","published_at":"2021-02-04T02:37:03.000Z","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) 1,425 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.  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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":"F3","text":"Includes 575 shares acquired on 03/10/2019 and previously reported on a Form 4 filed on 3/17/2020."}],"balance_after":21039,"source":{"system":"sec-edgar","filing":"0001437749-20-007008","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774920007008/rdgdoc.xml","form_type":"4"}},{"id":3185723,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"CFO and Treasurer"}}],"security":"Common Stock","published_at":"2020-04-03T01:33:06.000Z","date":"2020-02-10","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. 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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) 1,642 shares of unvested restricted stock granted on 03/31/2018 and (b) 2,808 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. 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The reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events specified in the restricted stock grant."}],"balance_after":16888,"source":{"system":"sec-edgar","filing":"0001437749-19-019641","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774919019641/rdgdoc.xml","form_type":"4"}},{"id":3397922,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54194,"kind":"person","name":"ROBERTSON GREG","position":1,"cik":"0001734771","reported_name":"ROBERTSON GREG","relationship":{"officer":true,"officer_title":"CFO and Treasurer"}}],"security":"COMMON STOCK","published_at":"2019-10-03T21:48:25.000Z","date":"2019-03-31","kind":"grant","acquired":true,"shares":4190,"price":23.74,"value":99470.6,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Reflects the grant of 4,190 shares of restricted stock to reporting person, 1,382 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) 1,642 shares of unvested restricted stock granted on 03/31/2018 and (b) 2,808 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. 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