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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 1,148 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 382 shares will vest on March 2, 2027, 382 shares will vest on March 2, 2028, and the remaining 384 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":"F3","text":"Reflects the grant of 1,148 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 382 shares will vest on March 2, 2027, 382 shares will vest on March 2, 2028, and the remaining 384 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":"F3","text":"Reflects the grant of 1,148 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 382 shares will vest on March 2, 2027, 382 shares will vest on March 2, 2028, and the remaining 384 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."}],"balance_after":8782,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":1148},"source":{"system":"sec-edgar","filing":"0001437749-26-006729","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774926006729/rdgdoc.xml","form_type":"4"}},{"id":865117,"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":"Restricted Stock Units","published_at":"2026-03-03T23:51:44.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":false,"shares":1926,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"The reporting person received an award of 5,838 time-based restricted stock units granted 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":"F2","text":"The reporting person received an award of 5,838 time-based restricted stock units granted 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":"F2","text":"The reporting person received an award of 5,838 time-based restricted stock units granted 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":"F2","text":"The reporting person received an award of 5,838 time-based restricted stock units granted 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":"0001437749-26-006729","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774926006729/rdgdoc.xml","form_type":"4"}},{"id":865116,"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":"2026-03-03T23:51:44.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":527,"price":27.3,"value":14387.1,"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."}],"balance_after":70565,"source":{"system":"sec-edgar","filing":"0001437749-26-006729","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774926006729/rdgdoc.xml","form_type":"4"}},{"id":865115,"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":"2026-03-03T23:51:44.000Z","date":"2026-03-01","kind":"exercise","planned":false,"acquired":true,"shares":1926,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reporting person received an award of 5,838 time-based restricted stock units granted 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."}],"balance_after":71092,"source":{"system":"sec-edgar","filing":"0001437749-26-006729","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774926006729/rdgdoc.xml","form_type":"4"}},{"id":865114,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54193,"kind":"person","name":"MELVILLE DAVID R. III","position":1,"cik":"0001734795","reported_name":"MELVILLE DAVID R. 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In accordance with the Deferred Compensation Plan, the reporting person will receive a lump sum cash distribution in an amount equal to the vested securities deferred under the Deferred Compensation Plan, plus any earnings or losses attributable thereto, on the first business day following the month in which the reporting person's separation of service, death, or disability occurs."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"Reflects the grant of 13,121 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 4,373 shares will vest on March 2, 2027, 4,373 shares will vest on March 2, 2028, and the remaining 4,375 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. The reporting person has irrevocably elected to defer the reported securities under the Deferred Compensation Plan. In accordance with the Deferred Compensation Plan, the reporting person will receive a lump sum cash distribution in an amount equal to the vested securities deferred under the Deferred Compensation Plan, plus any earnings or losses attributable thereto, on the first business day following the month in which the reporting person's separation of service, death, or disability occurs."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"Reflects the grant of 13,121 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 4,373 shares will vest on March 2, 2027, 4,373 shares will vest on March 2, 2028, and the remaining 4,375 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. The reporting person has irrevocably elected to defer the reported securities under the Deferred Compensation Plan. In accordance with the Deferred Compensation Plan, the reporting person will receive a lump sum cash distribution in an amount equal to the vested securities deferred under the Deferred Compensation Plan, plus any earnings or losses attributable thereto, on the first business day following the month in which the reporting person's separation of service, death, or disability occurs."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"Reflects the grant of 13,121 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 4,373 shares will vest on March 2, 2027, 4,373 shares will vest on March 2, 2028, and the remaining 4,375 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. The reporting person has irrevocably elected to defer the reported securities under the Deferred Compensation Plan. In accordance with the Deferred Compensation Plan, the reporting person will receive a lump sum cash distribution in an amount equal to the vested securities deferred under the Deferred Compensation Plan, plus any earnings or losses attributable thereto, on the first business day following the month in which the reporting person's separation of service, death, or disability occurs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F7","text":"Includes: (a) 10,028 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) 10,917 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; (c) 3,280 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; and (d) 13,121 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":37346,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":13121},"source":{"system":"sec-edgar","filing":"0001437749-26-006728","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1624322/000143774926006728/rdgdoc.xml","form_type":"4"}},{"id":865113,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":54193,"kind":"person","name":"MELVILLE DAVID R. 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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":"F5","text":"Reflects the grant of 3,280 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 1,093 shares will vest on March 2, 2027, 1,093 shares will vest on March 2, 2028, and the remaining 1,094 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":"F5","text":"Reflects the grant of 3,280 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 1,093 shares will vest on March 2, 2027, 1,093 shares will vest on March 2, 2028, and the remaining 1,094 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":"F5","text":"Reflects the grant of 3,280 time-based restricted stock units granted to the reporting person on March 2, 2026, of which 1,093 shares will vest on March 2, 2027, 1,093 shares will vest on March 2, 2028, and the remaining 1,094 shares will vest on March 2, 2029. 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