General Business	3 Months Ended
Mar. 31, 2020
General Business [Abstract]
General Business	(1)GENERAL BUSINESS The interim financial data is unaudited; however, in our opinion, it includes all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the results for the interim periods. The condensed consolidated financial statements included herein have been prepared pursuant to the SEC’s rules and regulations; accordingly, certain information and footnote disclosures normally included in GAAP financial statements have been condensed or omitted. The results of operations and cash flows for the three months ended March 31, 2020, are not necessarily indicative of the results to be expected for future quarters or for the year ending December 31, 2020. Our organization and business, the accounting policies we follow, and other information are contained in the notes to our condensed consolidated financial statements filed as part of our 2019 Form 10‑K. This quarterly report should be read in conjunction with such 10‑K. The condensed consolidated financial statements include the accounts of Hallador Energy Company (hereinafter known as “we, us, or our”) and its wholly-owned subsidiaries Sunrise Coal, LLC (Sunrise) and Hourglass Sands, LLC (Hourglass), and Sunrise’s wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Sunrise is engaged in the production of steam coal from mines located in western Indiana. New Accounting Standards Issued and Adopted In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820), Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13). The amendments in this update modify the disclosure requirements for fair value measurements. For public business entities, the standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. We adopted ASU 2018-13 effective January 1, 2020. Adoption of ASU 2018-13 did not have a material impact on the Company’s condensed consolidated financial statements.

(1)GENERAL BUSINESS

The interim financial data is unaudited; however, in our opinion, it includes all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the results for the interim periods. The condensed consolidated financial statements included herein have been prepared pursuant to the SEC’s rules and regulations; accordingly, certain information and footnote disclosures normally included in GAAP financial statements have been condensed or omitted.

The results of operations and cash flows for the three months ended March 31, 2020, are not necessarily indicative of the results to be expected for future quarters or for the year ending December 31, 2020.

Our organization and business, the accounting policies we follow, and other information are contained in the notes to our condensed consolidated financial statements filed as part of our 2019 Form 10‑K. This quarterly report should be read in conjunction with such 10‑K.

The condensed consolidated financial statements include the accounts of Hallador Energy Company (hereinafter known as “we, us, or our”) and its wholly-owned subsidiaries Sunrise Coal, LLC (Sunrise) and Hourglass Sands, LLC (Hourglass), and Sunrise’s wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Sunrise is engaged in the production of steam coal from mines located in western Indiana.

New Accounting Standards Issued and Adopted

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820), Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13). The amendments in this update modify the disclosure requirements for fair value measurements. For public business entities, the standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. We adopted ASU 2018-13 effective January 1, 2020. Adoption of ASU 2018-13 did not have a material impact on the Company’s condensed consolidated financial statements.