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Vested shares will be delivered to the reporting person pursuant to the terms of the Second Amended and Restated 2008 Restricted Stock Unit Plan."},{"field":"shares","element":"transactionShares","label":"F5","text":"These shares were issued to the reporting person as consideration for his total annual equity compensation for service on the Issuer's board."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Each Restricted Stock Unit represents a contingent right to receive one share of Hallador Energy Common Stock. Vested shares will be delivered to the reporting person pursuant to the terms of the Second Amended and Restated 2008 Restricted Stock Unit Plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Each Restricted Stock Unit represents a contingent right to receive one share of Hallador Energy Common Stock. Vested shares will be delivered to the reporting person pursuant to the terms of the Second Amended and Restated 2008 Restricted Stock Unit Plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The Units shall fully vest May 27, 2027, subject in each case subject to Participant's continued Service through the applicable vesting date, subject to the terms and conditions set forth in the Second Amended and Restated 2008 Restricted Stock Unit Plan and Award Agreement."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Each Restricted Stock Unit represents a contingent right to receive one share of Hallador Energy Common Stock. Vested shares will be delivered to the reporting person pursuant to the terms of the Second Amended and Restated 2008 Restricted Stock Unit Plan."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"The Units shall fully vest May 27, 2027, subject in each case subject to Participant's continued Service through the applicable vesting date, subject to the terms and conditions set forth in the Second Amended and Restated 2008 Restricted Stock Unit Plan and Award Agreement."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F4","text":"Each Restricted Stock Unit represents a contingent right to receive one share of Hallador Energy Common Stock. Vested shares will be delivered to the reporting person pursuant to the terms of the Second Amended and Restated 2008 Restricted Stock Unit Plan."}],"balance_after":6316,"derivative":{"underlying":"Common Stock","underlying_shares":6316},"source":{"system":"sec-edgar","filing":"0001032385-26-000003","document":"form4-06022026_120644.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/788965/000103238526000003/form4-06022026_120644.xml","form_type":"4"}},{"id":956837,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":43032,"kind":"person","name":"LUBAR DAVID J","position":1,"cik":"0001032385","reported_name":"LUBAR DAVID J","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-12-31T22:40:22.000Z","date":"2025-12-30","kind":"grant","planned":false,"acquired":true,"shares":2851,"price":19.29,"value":54995.79,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares were issued to the reporting person as consideration for his total 2025 calendar year equity compensation for service on the Issuer's board."}],"balance_after":2851,"source":{"system":"sec-edgar","filing":"0001032385-25-000005","document":"form4-12312025_101219.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000103238525000005/form4-12312025_101219.xml","form_type":"4"}},{"id":1418503,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":43032,"kind":"person","name":"LUBAR DAVID J","position":1,"cik":"0001032385","reported_name":"LUBAR DAVID J","relationship":{"director":true,"ten_percent_owner":true}}],"security":"Common Stock","published_at":"2024-09-03T21:36:23.000Z","date":"2024-08-31","kind":"other","planned":false,"acquired":true,"shares":271763,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"SM Opportunities Fund, LLC"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"This form is being filed to report a change in the form of beneficial ownership of the shares as a result of a distribution of 271,763 shares of the issuer by LOFI to SMOF."},{"field":"shares","element":"transactionShares","label":"F4","text":"This form is being filed to report a change in the form of beneficial ownership of the shares as a result of a distribution of 271,763 shares of the issuer by LOFI to SMOF."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"This form is being filed to report a change in the form of beneficial ownership of the shares as a result of a distribution of 271,763 shares of the issuer by LOFI to SMOF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These securities are owned by SM Opportunities Fund, LLC (\"SMOF\"). Lubar & Co. is the sole manager of the fund. Mr. David Lubar, as CEO of Lubar & Co., may be deemed to share voting and dispositive power as to the shares held by SMOF. Mr. David Lubar disclaims beneficial ownership in the shares owned by LOFI, except to the extent of his respective pecuniary interest therein."}],"balance_after":271763,"source":{"system":"sec-edgar","filing":"0001437749-24-028281","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/788965/000143774924028281/rdgdoc.xml","form_type":"4"}},{"id":1418502,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":43032,"kind":"person","name":"LUBAR DAVID J","position":1,"cik":"0001032385","reported_name":"LUBAR DAVID J","relationship":{"director":true,"ten_percent_owner":true}}],"security":"Common Stock","published_at":"2024-09-03T21:36:23.000Z","date":"2024-08-31","kind":"other","planned":false,"acquired":false,"shares":271763,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Lubar Opportunities Fund I, LLC"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"This form is being filed to report a change in the form of beneficial ownership of the shares as a result of a distribution of 271,763 shares of the issuer by LOFI to SMOF."},{"field":"shares","element":"transactionShares","label":"F4","text":"This form is being filed to report a change in the form of beneficial ownership of the shares as a result of a distribution of 271,763 shares of the issuer by LOFI to SMOF."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This form is being filed to report a change in the form of beneficial ownership of the shares as a result of a distribution of 271,763 shares of the issuer by LOFI to SMOF."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F4","text":"This form is being filed to report a change in the form of beneficial ownership of the shares as a result of a distribution of 271,763 shares of the issuer by LOFI to SMOF."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"This form is being filed to report a change in the form of beneficial ownership of the shares as a result of a distribution of 271,763 shares of the issuer by LOFI to SMOF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"These securities are owned by Lubar Opportunities Fund I, LLC (\"LOFI\"). Lubar & Co. is the sole manager of the fund. Mr. David Lubar, as CEO of Lubar & Co., may be deemed to share voting and dispositive power as to the shares held by LOFI. 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Lubar & Co. is the sole manager of the fund. Mr. David Lubar, as CEO of Lubar & Co., may be deemed to share voting and dispositive power as to the shares held by LOFI. 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Lubar & Co. is the sole manager of the fund. Mr. David Lubar, as CEO of Lubar & Co., may be deemed to share voting and dispositive power as to the shares held by LOFI. Mr. David Lubar disclaims beneficial ownership in the shares owned by LOFI, except to the extent of his respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"These securities are owned by Lubar Opportunities Fund I, LLC (\"LOFI\"). Lubar & Co. is the sole manager of the fund. Mr. David Lubar, as CEO of Lubar & Co., may be deemed to share voting and dispositive power as to the shares held by LOFI. 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Lubar & Co. is the sole manager of the fund. Mr. David Lubar, as CEO of Lubar & Co., may be deemed to share voting and dispositive power as to the shares held by LOFI. Mr. David Lubar disclaims beneficial ownership in the shares owned by LOFI, except to the extent of his respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"These securities are owned by Lubar Opportunities Fund I, LLC (\"LOFI\"). Lubar & Co. is the sole manager of the fund. Mr. David Lubar, as CEO of Lubar & Co., may be deemed to share voting and dispositive power as to the shares held by LOFI. 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The share price was $6.254, based on the 30 day VWAP on 7/28/2022 when the Notes were issued."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"These securities are owned by Lubar Opportunities Fund I, LLC (\"LOFI\"). Lubar & Co. is the sole manager of the fund. Mr. David Lubar, as CEO of Lubar & Co., may be deemed to share voting and dispositive power as to the shares held by LOFI. 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Lubar & Co. is the sole manager of the fund. Mr. David Lubar, as CEO of Lubar & Co., may be deemed to share voting and dispositive power as to the shares held by LOFI. Mr. David Lubar disclaims beneficial ownership in the shares owned by LOFI, except to the extent of his respective pecuniary interest therein"}],"balance_after":3941557,"source":{"system":"sec-edgar","filing":"0001437749-22-014532","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000143774922014532/rdgdoc.xml","form_type":"4"}}]}