General Business	9 Months Ended
Sep. 30, 2018
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 and nine months ended September 30, 2018 are not necessarily indicative of the results to be expected for future quarters or for the year ending December 31, 2018. To maintain consistency and comparability, certain 2017 amounts have been reclassified to conform to the 2018 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 2017 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 13). New Accounting Standards Issued and Adopted In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 is a comprehensive revenue recognition standard that supersedes nearly all existing revenue recognition guidance under current U.S. GAAP and replaces it with a principle-based approach for determining revenue recognition. On January 1, 2018, we adopted the new accounting standard and all of the related amendments to all contracts using the modified retrospective method. Adoption of the new revenue standard did not result in a material cumulative effect adjustment to the opening balance of retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. We do not expect the adoption of the new revenue standard to have a material impact to our net income on an ongoing basis. See “Note 12 – Revenue” to these condensed consolidated financial statements for additional disclosures. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments (Topic 825): Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 requires equity investments that are not accounted for under the equity method of accounting or that do not result in consolidation of the investee to be measured at fair value with changes recognized in net earnings. ASU 2016-01 also eliminates the available-for-sale classification for equity investments that recognized changes in fair value as a component of other comprehensive income. We adopted ASU 2016-01 on January 1, 2018, using the modified retrospective method, which resulted in a $1.1 million (net of tax) cumulative-effect adjustment from accumulated other comprehensive income to retained earnings. Adoption of ASU 2016-01 did not have a material impact on our results of operations and/or cash flows. In November 2016, the FASB issued guidance regarding the presentation of restricted cash in the statement of cash flows (ASU 2016-18). This update is effective for annual reporting periods beginning after December 15, 2017, and early adoption is permitted. We have adopted the new standard as of January 1, 2018. Adoption of ASU 2016-18 did not have a material impact on the company’s results of operations and/or cash flows. In January 2017, the FASB issued new guidance to assist in determining if a set of assets and activities being acquired or sold is a business (ASU 2017-01). It also provided a framework to assist entities in evaluating whether both an input and a substantive process are present, which at a minimum, must be present to be considered a business. We have adopted the new standard as of January 1, 2018. The standard does not have an impact on our historical recognition of asset acquisitions and business combinations. However, we expect there may be an impact on how we account for such acquisitions in the future. In February 2018, the FASB issued ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. ASU 2018-02 allows companies to reclassify stranded tax effects resulting from the 2017 Tax Act from accumulated other comprehensive income to retained earnings. The company elected to early adopt ASU 2018-02 on January 1, 2018, which resulted in a reclassification of $192,000 of stranded tax effects, related to our unrealized gain on marketable securities, from accumulated other comprehensive income to retained earnings. Adoption of ASU 2018-02 did not have a material impact on our results of operations and/or cash flows. New Accounting Standards Issued and Not Yet 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 disclosing key information about lease arrangements. The new guidance will classify leases as either finance or operating (similar to current standard’s “capital” or “operating” classification), 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. We are currently in the process of accumulating all contractual lease arrangements in order to determine the impact on our financial statements and do not believe we have significant amounts of off-balance sheet leases; accordingly, we do not expect the adoption of ASU 2016-02 to have a material impact on our condensed consolidated financial statements. We continue to monitor closely the activities of the FASB and various non-authoritative groups with respect to implementation issues that could affect our evaluation.

(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 and nine months ended September 30, 2018 are not necessarily indicative of the results to be expected for future quarters or for the year ending December 31, 2018. To maintain consistency and comparability, certain 2017 amounts have been reclassified to conform to the 2018 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 2017 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 13).

New Accounting Standards Issued and Adopted

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 is a comprehensive revenue recognition standard that supersedes nearly all existing revenue recognition guidance under current U.S. GAAP and replaces it with a principle-based approach for determining revenue recognition. On January 1, 2018, we adopted the new accounting standard and all of the related amendments to all contracts using the modified retrospective method. Adoption of the new revenue standard did not result in a material cumulative effect adjustment to the opening balance of retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. We do not expect the adoption of the new revenue standard to have a material impact to our net income on an ongoing basis. See “Note 12 – Revenue” to these condensed consolidated financial statements for additional disclosures.

In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments (Topic 825): Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 requires equity investments that are not accounted for under the equity method of accounting or that do not result in consolidation of the investee to be measured at fair value with changes recognized in net earnings. ASU 2016-01 also eliminates the available-for-sale classification for equity investments that recognized changes in fair value as a component of other comprehensive income. We adopted ASU 2016-01 on January 1, 2018, using the modified retrospective method, which resulted in a $1.1 million (net of tax) cumulative-effect adjustment from accumulated other comprehensive income to retained earnings. Adoption of ASU 2016-01 did not have a material impact on our results of operations and/or cash flows.

In November 2016, the FASB issued guidance regarding the presentation of restricted cash in the statement of cash flows (ASU 2016-18). This update is effective for annual reporting periods beginning after December 15, 2017, and early adoption is permitted. We have adopted the new standard as of January 1, 2018. Adoption of ASU 2016-18 did not have a material impact on the company’s results of operations and/or cash flows.

In January 2017, the FASB issued new guidance to assist in determining if a set of assets and activities being acquired or sold is a business (ASU 2017-01). It also provided a framework to assist entities in evaluating whether both an input and a substantive process are present, which at a minimum, must be present to be considered a business. We have adopted the new standard as of January 1, 2018. The standard does not have an impact on our historical recognition of asset acquisitions and business combinations. However, we expect there may be an impact on how we account for such acquisitions in the future.

In February 2018, the FASB issued ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. ASU 2018-02 allows companies to reclassify stranded tax effects resulting from the 2017 Tax Act from accumulated other comprehensive income to retained earnings. The company elected to early adopt ASU 2018-02 on January 1, 2018, which resulted in a reclassification of $192,000 of stranded tax effects, related to our unrealized gain on marketable securities, from accumulated other comprehensive income to retained earnings. Adoption of ASU 2018-02 did not have a material impact on our results of operations and/or cash flows.

New Accounting Standards Issued and Not Yet 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 disclosing key information about lease arrangements. The new guidance will classify leases as either finance or operating (similar to current standard’s “capital” or “operating” classification), 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. We are currently in the process of accumulating all contractual lease arrangements in order to determine the impact on our financial statements and do not believe we have significant amounts of off-balance sheet leases; accordingly, we do not expect the adoption of ASU 2016-02 to have a material impact on our condensed consolidated financial statements. We continue to monitor closely the activities of the FASB and various non-authoritative groups with respect to implementation issues that could affect our evaluation.