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Vested shares will be delivered to the reporting person pursuant to the terms of the 2nd Amended and Restated 2008 RSU Plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Units shall vest in the amount of 4,986 RSUs on December 1, 2026 and, 4,987 RSUs on December 1, 2027, subject in each case subject to Participant's continued Service through the applicable vesting date, and shall vest in full subject to Participant's continued Service through to the date of a Change in Control, and otherwise in accordance with the terms of the Plan and this Agreement."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Units shall vest in the amount of 4,986 RSUs on December 1, 2026 and, 4,987 RSUs on December 1, 2027, subject in each case subject to Participant's continued Service through the applicable vesting date, and shall vest in full subject to Participant's continued Service through to the date of a Change in Control, and otherwise in accordance with the terms of the Plan and this Agreement."}],"balance_after":9973,"derivative":{"underlying":"Common Stock","underlying_shares":9973},"source":{"system":"sec-edgar","filing":"0002102403-26-000003","document":"form4-03112026_080330.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000210240326000003/form4-03112026_080330.xml","form_type":"4"}},{"id":937924,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":43031,"kind":"person","name":"Gray Zarrell Thomas","position":1,"cik":"0002030612","reported_name":"Gray Zarrell Thomas","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-01-16T23:04:43.000Z","date":"2026-01-14","kind":"other","planned":false,"acquired":true,"shares":13888,"price":18,"value":249984.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On January 14, 2026, the Reporting Person purchased 13,888 shares of the Issuer's Common Stock in connection with a firm commitment underwritten offering."}],"balance_after":76480,"source":{"system":"sec-edgar","filing":"0002030612-26-000004","document":"form4-01162026_110138.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000203061226000004/form4-01162026_110138.xml","form_type":"4"}},{"id":937923,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":37470,"kind":"person","name":"Wesley Charles Ray IV","position":1,"cik":"0001750200","reported_name":"Wesley Charles Ray IV","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-01-16T19:26:08.000Z","date":"2026-01-14","kind":"other","planned":false,"acquired":true,"shares":55555,"price":18,"value":999990.0,"ownership":{"direct":false,"nature":"By the Charles R. 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These shares were sold in multiple transactions at prices ranging from $19.05 to $19.30, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":1874903,"source":{"system":"sec-edgar","filing":"0001104659-25-092939","document":"tm2526861-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/788965/000110465925092939/tm2526861-1_4seq1.xml","form_type":"4"}},{"id":1033515,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-09-24T20:04:50.000Z","date":"2025-09-22","kind":"sale","planned":false,"acquired":false,"shares":19165,"price":19.2546,"value":369014.409,"ownership":{"direct":false,"nature":"By David Hardie Separate Property Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.10 to $19.44, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":119924,"source":{"system":"sec-edgar","filing":"0001104659-25-092939","document":"tm2526861-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/788965/000110465925092939/tm2526861-1_4seq1.xml","form_type":"4"}},{"id":1033514,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-09-24T20:04:50.000Z","date":"2025-09-22","kind":"sale","planned":false,"acquired":false,"shares":57494,"price":19.2546,"value":1107023.9724,"ownership":{"direct":false,"nature":"By Hallador Alternative Assets Fund LLC"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $18.87 to $19.27, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":1938974,"source":{"system":"sec-edgar","filing":"0001104659-25-051563","document":"tm2515839-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000110465925051563/tm2515839-1_4seq1.xml","form_type":"4"}},{"id":1173680,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":52355,"kind":"person","name":"Bilsland Brent K","position":1,"cik":"0001424577","reported_name":"Bilsland Brent K","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2025-04-11T22:54:40.000Z","date":"2025-03-31","kind":"tax_withholding","planned":false,"acquired":false,"shares":55849,"price":12.28,"value":685825.72,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This amendment is being filed to address a revision in the number of shares withheld from 53032 to 55849 for payment of tax liability incident to the vesting of Restricted Stock Units."}],"balance_after":1087388,"source":{"system":"sec-edgar","filing":"0001415889-25-010597","document":"form4a-04112025_100435.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000141588925010597/form4a-04112025_100435.xml","form_type":"4/A","original_submission_date":"2025-04-02"}},{"id":1173679,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":52354,"kind":"person","name":"Lovell Heath Aaron","position":1,"cik":"0001970432","reported_name":"Lovell Heath Aaron","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President-Hallador Power"}}],"security":"COMMON STOCK","published_at":"2025-04-11T21:03:34.000Z","date":"2025-03-31","kind":"tax_withholding","planned":false,"acquired":false,"shares":36915,"price":12.28,"value":453316.2,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This amendment is being filed to address a revision in the number of shares withheld from 35482 to 36915 for payment of tax liability incident to the vesting of Restricted Stock Units"}],"balance_after":129952,"source":{"system":"sec-edgar","filing":"0001415889-25-010585","document":"form4a-04112025_090430.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000141588925010585/form4a-04112025_090430.xml","form_type":"4/A","original_submission_date":"2025-04-02"}},{"id":1173678,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":43031,"kind":"person","name":"Gray Zarrell Thomas","position":1,"cik":"0002030612","reported_name":"Gray Zarrell Thomas","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-04-11T13:37:50.000Z","date":"2025-04-10","kind":"purchase","planned":false,"acquired":true,"shares":9000,"price":13.6,"value":122400.0,"ownership":{"direct":true},"balance_after":60000,"source":{"system":"sec-edgar","filing":"0001415889-25-010563","document":"form4-04112025_010446.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000141588925010563/form4-04112025_010446.xml","form_type":"4"}},{"id":1175001,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":37470,"kind":"person","name":"Wesley Charles Ray IV","position":1,"cik":"0001750200","reported_name":"Wesley Charles Ray IV","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-04-09T19:12:26.000Z","date":"2025-04-07","kind":"purchase","planned":false,"acquired":true,"shares":10000,"price":10.3978,"value":103978.0,"ownership":{"direct":false,"nature":"By the Charles R. 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Vested shares will be delivered to the reporting person pursuant to the terms of the Amended and Restated 2008 RSU Plan."},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each Restricted Stock Unit awarded on September 6, 2024, 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 Amended and Restated 2008 RSU Plan."},{"field":"shares","element":"transactionShares","label":"F3","text":"Each Restricted Stock Unit awarded on September 6, 2024, 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 Amended and Restated 2008 RSU Plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Each Restricted Stock Unit awarded on September 6, 2024, 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 Amended and Restated 2008 RSU Plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Each Restricted Stock Unit awarded on September 6, 2024, 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 Amended and Restated 2008 RSU Plan."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Each Restricted Stock Unit awarded on September 6, 2024, 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 Amended and Restated 2008 RSU Plan."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F3","text":"Each Restricted Stock Unit awarded on September 6, 2024, 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 Amended and Restated 2008 RSU Plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Each Restricted Stock Unit awarded on September 6, 2024, 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 Amended and Restated 2008 RSU Plan."}],"balance_after":81728,"derivative":{"exercise_date":"2025-03-31","underlying":"Common Stock","underlying_shares":40864},"source":{"system":"sec-edgar","filing":"0001415889-25-009785","document":"form4-04022025_110456.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/788965/000141588925009785/form4-04022025_110456.xml","form_type":"4"}},{"id":1185341,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":52354,"kind":"person","name":"Lovell Heath Aaron","position":1,"cik":"0001970432","reported_name":"Lovell Heath Aaron","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President-Hallador Power"}}],"security":"Restricted Stock Unit","published_at":"2025-04-02T23:50:00.000Z","date":"2025-03-31","kind":"exercise","planned":false,"acquired":false,"shares":57971,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"Each Restricted Stock Unit awarded on April 1, 2022, 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 Amended and Restated 2008 RSU Plan."},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each Restricted Stock Unit awarded on April 1, 2022, 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 Amended and Restated 2008 RSU Plan."},{"field":"shares","element":"transactionShares","label":"F2","text":"Each Restricted Stock Unit awarded on April 1, 2022, 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 Amended and Restated 2008 RSU Plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Each Restricted Stock Unit awarded on April 1, 2022, 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 Amended and Restated 2008 RSU Plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Each Restricted Stock Unit awarded on April 1, 2022, represents a contingent right to receive one share of Hallador Energy Common Stock. 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Wesley IV Revocable Trust, may be deemed to have voting and dispositive power as to the shares held by the trust."}],"balance_after":184302,"source":{"system":"sec-edgar","filing":"0001437749-24-029395","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000143774924029395/rdgdoc.xml","form_type":"4"}},{"id":1413211,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":72113,"kind":"person","name":"Hargrave Marjorie Anne","position":1,"cik":"0001783211","reported_name":"Hargrave Marjorie Anne","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Restricted Stock Units","published_at":"2024-09-06T21:54:12.000Z","date":"2024-09-06","kind":"grant","planned":false,"acquired":true,"shares":70053,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one share of Hallador Energy Common Stock."},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one share of Hallador Energy Common Stock."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one share of Hallador Energy Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Restricted stock units shall vest in the amount of 23,351 restricted stock units on March 31st of each of 2025, 2026 and 2027, subject to the Covered Person's continued Service through the applicable vesting date, and shall vest in full subject to the Covered Person's continued Service through to the date of a Change in Control, and otherwise in accordance with the terms of the RSU Plan and the applicable award agreement."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Restricted stock units shall vest in the amount of 23,351 restricted stock units on March 31st of each of 2025, 2026 and 2027, subject to the Covered Person's continued Service through the applicable vesting date, and shall vest in full subject to the Covered Person's continued Service through to the date of a Change in Control, and otherwise in accordance with the terms of the RSU Plan and the applicable award agreement."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one share of Hallador Energy Common Stock."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one share of Hallador Energy Common Stock."}],"balance_after":70053,"derivative":{"underlying":"Common Stock","underlying_shares":70053},"source":{"system":"sec-edgar","filing":"0001437749-24-028684","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000143774924028684/rdgdoc.xml","form_type":"4"}},{"id":1413210,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":52355,"kind":"person","name":"Bilsland Brent K","position":1,"cik":"0001424577","reported_name":"Bilsland Brent K","relationship":{"director":true,"officer":true,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2024-09-06T21:52:47.000Z","date":"2024-09-06","kind":"grant","planned":false,"acquired":true,"shares":315236,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","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 Amended and Restated 2008 RSU Plan."},{"field":"shares","element":"transactionShares","label":"F1","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 Amended and Restated 2008 RSU Plan."},{"field":"price","element":"transactionPricePerShare","label":"F1","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 Amended and Restated 2008 RSU Plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Restricted stock units shall vest in the amount of 105,079 restricted stock units on March 31st of each of 2025 and 2026, and 105,078 restricted stock units on March 31, 2027, subject to the Covered Person's continued Service, as defined in the RSU Plan, through the applicable vesting date, and shall vest in full subject to the Covered Person's continued Service through to the date of a Change in Control, as defined in the RSU Plan, and otherwise in accordance with the terms of the RSU Plan and the applicable award agreement."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Restricted stock units shall vest in the amount of 105,079 restricted stock units on March 31st of each of 2025 and 2026, and 105,078 restricted stock units on March 31, 2027, subject to the Covered Person's continued Service, as defined in the RSU Plan, through the applicable vesting date, and shall vest in full subject to the Covered Person's continued Service through to the date of a Change in Control, as defined in the RSU Plan, and otherwise in accordance with the terms of the RSU Plan and the applicable award agreement."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F1","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 Amended and Restated 2008 RSU Plan."}],"balance_after":315236,"derivative":{"underlying":"Common Stock","underlying_shares":315236},"source":{"system":"sec-edgar","filing":"0001437749-24-028682","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/788965/000143774924028682/rdgdoc.xml","form_type":"4"}},{"id":1413209,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":52354,"kind":"person","name":"Lovell Heath Aaron","position":1,"cik":"0001970432","reported_name":"Lovell Heath Aaron","relationship":{"officer":true,"officer_title":"President-Hallador Power"}}],"security":"Restricted Stock Units","published_at":"2024-09-06T21:50:56.000Z","date":"2024-09-06","kind":"grant","planned":false,"acquired":true,"shares":122592,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","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 Amended and Restated 2008 RSU Plan."},{"field":"shares","element":"transactionShares","label":"F1","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 Amended and Restated 2008 RSU Plan."},{"field":"shares","element":"transactionShares","label":"F2","text":"Restricted Stock Units shall vest in the amount of 40,864 restricted stock units on March 31st of each of 2025, 2026 and 2027, subject to the Covered Person's continued Service through the applicable vesting date, and shall vest in full subject to the Covered Person's continued Service through to the date of a Change in Control, and otherwise in accordance with the terms of the RSU Plan and the applicable award agreement."},{"field":"price","element":"transactionPricePerShare","label":"F1","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 Amended and Restated 2008 RSU Plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Restricted Stock Units shall vest in the amount of 40,864 restricted stock units on March 31st of each of 2025, 2026 and 2027, subject to the Covered Person's continued Service through the applicable vesting date, and shall vest in full subject to the Covered Person's continued Service through to the date of a Change in Control, and otherwise in accordance with the terms of the RSU Plan and the applicable award agreement."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Restricted Stock Units shall vest in the amount of 40,864 restricted stock units on March 31st of each of 2025, 2026 and 2027, subject to the Covered Person's continued Service through the applicable vesting date, and shall vest in full subject to the Covered Person's continued Service through to the date of a Change in Control, and otherwise in accordance with the terms of the RSU Plan and the applicable award agreement."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F1","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 Amended and Restated 2008 RSU Plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","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 Amended and Restated 2008 RSU Plan."}],"balance_after":122592,"derivative":{"underlying":"Common Stock","underlying_shares":122592},"source":{"system":"sec-edgar","filing":"0001437749-24-028680","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/788965/000143774924028680/rdgdoc.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. 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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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