General Business	3 Months Ended
Mar. 31, 2019
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, 2019 are not necessarily indicative of the results to be expected for future quarters or for the year ending December 31, 2019. To maintain consistency and comparability, certain 2018 amounts have been reclassified to conform to the 2019 presentation. 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 2018 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. Hourglass is in the development stage and is engaged in the production of frac sand in the State of Colorado (see Note 14). New Accounting Standards Issued and Adopted In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 increases transparency and comparability among organizations by requiring lessees to record right-to-use assets and corresponding lease liabilities on the balance sheet and disclose key information about lease arrangements. The new guidance classifies leases as either finance or operating, with classification affecting the pattern of income recognition in the statement of income. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The FASB issued clarifications, updates and implementation guidance to ASU 2016-02, such as ASU 2018-11, Leases (Topic 842) (ASU 2018-11) which provides practical expedients for transition to Topic 842. ASU 2018-11 provides an option to apply the transition provisions of the new standard at its adoption date instead of at the earliest comparative period presented and permits lessors to not separate non-lease components from the associated lease component if certain conditions are met. We adopted ASU 2016-02 effective January 1, 2019 and elected the option to not restate comparative periods in transition and also elected the practical expedients within the standard which permits us to not reassess our prior conclusions about lease identification, lease classification and initial direct costs. Additionally, the Company made an election to not separate lease and non-lease components for all leases and will not use hindsight. The adoption of the standard had no impact on the Company’s consolidated income statement or statement of cash flows. Effective January 1, 2019, we recorded a right-to-use asset and corresponding lease liability of $0.5 million. New Accounting Standards Issued and Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, Financial Instruments–Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13). ASU 2016-13 changes the impairment model for most financial assets and certain other instruments to require the use of a new forward-looking "expected loss" model that generally will result in earlier recognition of allowances for losses. The new standard will require disclosure of significantly more information related to these items. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for the fiscal year beginning after December 15, 2018, including interim periods. We are currently evaluating the effect of adopting ASU 2016-13, but do not anticipate it will have a material impact on our 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, 2019 are not necessarily indicative of the results to be expected for future quarters or for the year ending December 31, 2019. To maintain consistency and comparability, certain 2018 amounts have been reclassified to conform to the 2019 presentation.

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 2018 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. Hourglass is in the development stage and is engaged in the production of frac sand in the State of Colorado (see Note 14).

New Accounting Standards Issued and Adopted

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 increases transparency and comparability among organizations by requiring lessees to record right-to-use assets and corresponding lease liabilities on the balance sheet and disclose key information about lease arrangements. The new guidance classifies leases as either finance or operating, with classification affecting the pattern of income recognition in the statement of income. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The FASB issued clarifications, updates and implementation guidance to ASU 2016-02, such as ASU 2018-11, Leases (Topic 842) (ASU 2018-11) which provides practical expedients for transition to Topic 842. ASU 2018-11 provides an option to apply the transition provisions of the new standard at its adoption date instead of at the earliest comparative period presented and permits lessors to not separate non-lease components from the associated lease component if certain conditions are met.

We adopted ASU 2016-02 effective January 1, 2019 and elected the option to not restate comparative periods in transition and also elected the practical expedients within the standard which permits us to not reassess our prior conclusions about lease identification, lease classification and initial direct costs. Additionally, the Company made an election to not separate lease and non-lease components for all leases and will not use hindsight. The adoption of the standard had no impact on the Company’s consolidated income statement or statement of cash flows. Effective January 1, 2019, we recorded a right-to-use asset and corresponding lease liability of $0.5 million.

New Accounting Standards Issued and Not Yet Adopted

In June 2016, the FASB issued ASU 2016-13, Financial Instruments–Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13). ASU 2016-13 changes the impairment model for most financial assets and certain other instruments to require the use of a new forward-looking "expected loss" model that generally will result in earlier recognition of allowances for losses. The new standard will require disclosure of significantly more information related to these items. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for the fiscal year beginning after December 15, 2018, including interim periods. We are currently evaluating the effect of adopting ASU 2016-13, but do not anticipate it will have a material impact on our condensed consolidated financial statements.