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The time-based restricted stock units will fully vest on June 25, 2027. 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":"F1","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 June 25, 2026. The time-based restricted stock units will fully vest on June 25, 2027. 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":"F1","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 June 25, 2026. The time-based restricted stock units will fully vest on June 25, 2027. 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":2014,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":1016},"source":{"system":"sec-edgar","filing":"0001437749-26-022052","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2005812/000143774926022052/rdgdoc.xml","form_type":"4"}},{"id":724222,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":34860,"kind":"person","name":"Quirk Aimee M","position":1,"cik":"0002005812","reported_name":"Quirk Aimee M","relationship":{"director":true}}],"security":"COMMON STOCK","published_at":"2026-06-29T22:21:58.000Z","date":"2026-06-26","kind":"exercise","planned":false,"acquired":true,"shares":1016,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reporting person received an award of 1,016 time-based restricted stock units on June 26, 2025, vesting on the first anniversary of the issuance date."}],"balance_after":2533,"source":{"system":"sec-edgar","filing":"0001437749-26-022052","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2005812/000143774926022052/rdgdoc.xml","form_type":"4"}},{"id":1099409,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":34860,"kind":"person","name":"Quirk Aimee M","position":1,"cik":"0002005812","reported_name":"Quirk Aimee M","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2025-06-30T23:47:57.000Z","date":"2025-06-26","kind":"grant","planned":false,"acquired":true,"shares":1016,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","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 June 26, 2025. The time-based restricted stock units will fully vest on June 26, 2026. 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":"F2","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 June 26, 2025. The time-based restricted stock units will fully vest on June 26, 2026. 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":"F2","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 June 26, 2025. The time-based restricted stock units will fully vest on June 26, 2026. 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":1016,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":1016},"source":{"system":"sec-edgar","filing":"0001437749-25-021617","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2005812/000143774925021617/rdgdoc.xml","form_type":"4"}},{"id":1533896,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":34860,"kind":"person","name":"Quirk Aimee M","position":1,"cik":"0002005812","reported_name":"Quirk Aimee M","relationship":{"director":true}}],"security":"Common Stock","published_at":"2024-04-29T21:55:38.000Z","date":"2024-04-25","kind":"grant","planned":false,"acquired":true,"shares":1149,"price":21.77,"value":25013.73,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Reflects the grant of restricted stock to reporting person.  The restricted stock fully vests on April 26, 2025."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) 368 shares of restricted stock granted on January 18, 2024, which vest on May 8, 2024, and (b) 1,149 shares of restricted stock granted on April 25, 2024, which vest on April 26, 2025."}],"balance_after":1517,"source":{"system":"sec-edgar","filing":"0001437749-24-013793","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2005812/000143774924013793/rdgdoc.xml","form_type":"4"}},{"id":1674372,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":34860,"kind":"person","name":"Quirk Aimee M","position":1,"cik":"0002005812","reported_name":"Quirk Aimee M","relationship":{"director":true}}],"security":"COMMON STOCK","published_at":"2024-01-22T22:23:36.000Z","date":"2024-01-18","kind":"grant","planned":false,"acquired":true,"shares":368,"price":22.67,"value":8342.56,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Reflects the grant of restricted stock to reporting person.  The restricted stock fully vests on May 8, 2024."}],"balance_after":368,"source":{"system":"sec-edgar","filing":"0001437749-24-001880","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2005812/000143774924001880/rdgdoc.xml","form_type":"4"}}]}