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Significant Accounting Policies (Policies) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Consolidation, Policy [Policy Text Block] | Basis of Presentation and Consolidation The 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.
Segment Reporting, Policy [Policy Text Block] | Segment Information The Company’s significant operating segment includes the two Oaktown underground mines located in southwestern Indiana. The Company’s chief operating decision maker (“CODM”) reviews the operating results, assesses performance and makes decisions about allocation of resources to this segment at the mine level, however, we aggregate the results of operations of the mines for reporting purposes since the nature of the product, production process, customer type, product distribution, and long-term economic characteristics at each mine are similar.
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] | Allowance for Doubtful Accounts The Company evaluates the need for an allowance for uncollectible receivables based on a review of account balances that are likely to be uncollectible, as determined by such variables as customer creditworthiness, the age of the receivables and disputed amounts. Historically, credit losses have been insignificant. At December 31, 2020 and 2019, no allowance was recorded for uncollectible accounts receivable as all amounts were deemed collectible.
Inventory Supplies, Policy [Policy Text Block] | Inventory Inventory and parts and supplies are valued at the lower of average cost or net realizable value determined using the first-in first-out method. Inventory costs include labor, supplies, operating overhead, and other related costs incurred at or on behalf of the mining location, including depreciation, depletion, and amortization of equipment, buildings, mineral rights, and mine development costs.
Receivables and Portions of Securitizations that can be Prepaid at Potential Loss, Policy [Policy Text Block] | Prepaid expenses Prepaid expenses include prepaid insurance, prepaid maintenance expense, and a prepaid balance with our primary parts and supplies vendor.
Advance Royalties [Policy Text Block] | Advanced Royalties Coal leases that require minimum annual or advance payments and are recoverable from future production are generally deferred and charged to expense as the coal is subsequently produced. Advance royalties are included in other assets.
Mining Properties [Policy Text Block] | Mining Properties Mining properties are recorded at cost. Interest costs applicable to major asset additions are capitalized during the construction period. Expenditures that extend the useful lives or increase the productivity of the assets are capitalized. The cost of maintenance and repairs that do not extend the useful lives or increase the productivity of the assets are expensed as incurred. Other than land and most mining equipment, mining properties are depreciated using the units-of-production method over the estimated recoverable reserves. Most surface and underground mining equipment is depreciated using estimated useful lives ranging from three to twenty-five years. If facts and circumstances suggest that a long-lived asset may be impaired, the carrying value is reviewed for recoverability. If this review indicates that the carrying value of the asset will not be recoverable through estimated undiscounted future net cash flows related to the asset over its remaining life, then an impairment loss is recognized by reducing the carrying value of the asset to its estimated fair value. See Note 2 for further discussion of impairments.
Mine Development [Policy Text Block] | Mine Development Costs of developing new mines, including asset retirement obligation assets, or significantly expanding the capacity of existing mines, are capitalized and amortized using the units-of-production method over estimated recoverable reserves.
Asset Retirement Obligation [Policy Text Block] | Asset Retirement Obligations (ARO) – Reclamation At the time they are incurred, legal obligations associated with the retirement of long-lived assets are reflected at their estimated fair value, with a corresponding charge to mine development. Obligations are typically incurred when we commence development of underground and surface mines and include reclamation of support facilities, refuse areas and slurry ponds. Obligations are reflected at the present value of their future cash flows. We reflect accretion of the obligations for the period from the date they are incurred through the date they are extinguished. The ARO assets are amortized using the units-of-production method over estimated recoverable (proved and probable) reserves. We are using credit-adjusted risk-free discount rates ranging from 5.0% to 10% to discount the obligation. Federal and state laws require that mines be reclaimed in accordance with specific standards and approved reclamation plans, as outlined in mining permits. Activities include reclamation of pit and support acreage at surface mines, sealing portals at underground mines, and reclamation of refuse areas and slurry ponds. We review our ARO at least annually and reflect revisions for permit changes, changes in our estimated reclamation costs and changes in the estimated timing of such costs. In the event we are not able to perform reclamation, we have surety bonds totaling $27 million to cover ARO. The table below (in thousands) reflects the changes to our ARO:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Balance, beginning of year |  | $ | 15,764 |  |  | $ | 14,646 |
Accretion |  |  | 1,381 |  |  |  | 1,272 |
Revisions |  |  | — |  |  |  | 95 |
Payments |  |  | (868 | ) |  |  | (249 | )
Balance, end of year |  |  | 16,277 |  |  |  | 15,764 |
Less current portion |  |  | (100 | ) |  |  | (70 | )
Long-term balance, end of year |  | $ | 16,177 |  |  | $ | 15,694 |
Derivatives, Policy [Policy Text Block] | Interest Rate Swaps The Company generally utilizes derivative instruments to manage exposures to interest rate risk on long-term debt. The Company enters into interest rate swaps in order to achieve a mix of fixed and variable rate debt that it deems appropriate. These interest rate swaps have not been designated as hedging instruments and are accounted for as an asset or a liability in the accompanying Consolidated Balance Sheets at their fair value. Realized gains and losses are classified as operating activities in the accompanying Consolidated Statements of Cash Flows.
Statement of Cash Flows [Policy Text Block] | Statement of Cash Flows Cash equivalents include investments with maturities when purchased of three months or less.
Income Tax, Policy [Policy Text Block] | Income Taxes Income taxes are provided based on the liability method of accounting. The provision for income taxes is based on pretax financial income. Deferred tax assets and liabilities are recognized for the future expected tax consequences of temporary differences between income tax and financial reporting and principally relate to differences in the tax basis of assets and liabilities and their reported amounts, using enacted tax rates in effect for the year in which differences are expected to reverse.
Earnings Per Share, Policy [Policy Text Block] | Net Income (Loss) per Share Basic net income (loss) per share is computed on the basis of the weighted average number of shares of common stock outstanding during the period using the two-class method for our common shares and RSUs which share in the Company’s earnings. Diluted net income (loss) per share is computed on the basis of the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period. Dilutive potential common shares include restricted stock units and are included in basic net income (loss) per share, using the two-class method.
Use of Estimates, Policy [Policy Text Block] | Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with generally accepted accounting principles requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Actual amounts could differ from those estimates. The most significant estimates included in the preparation of the financial statements relate to: (i) deferred income tax accounts, (ii) coal reserves, (iii) depreciation, depletion, and amortization, (iv) estimates relating to interest rate swaps, and (v) estimates used in our impairment analysis and measurement of impairments.
Insurance, Long-Duration Contract [Policy Text Block] | Long-term Contracts As of December 31, 2020, we are committed to supplying our customers up to a maximum of 21.6 million tons of coal through 2027 of which 13.7 million tons are priced. For 2020, we derived 79% of our coal sales from four customers, each representing at least 10% of our coal sales. 87% of our accounts receivable was from four customers, each representing more than 10% of the December 31, 2020 balance. For 2019, we derived 70% of our coal sales from four customers, each representing at least 10% of our coal sales. 68% of our accounts receivable was from three customers, each representing more than 10% of the December 31, 2019 balance.
Share-based Payment Arrangement [Policy Text Block] | Stock-based Compensation Stock-based compensation is measured at the grant date based on the fair value of the award and is recognized as expense over the applicable vesting period of the stock award (generally two to four years) using the straight-line method.

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- Definition Disclosure of accounting policy for legal obligation associated with retirement of long-lived asset that results from acquisition, construction, or development or from normal operation of long-lived asset. Excludes environmental remediation liability from improper or other-than-normal operation of long-lived asset, obligation arising in connection with leased property that meets definition of lease payments or variable lease payments and from plan to sell or otherwise dispose of a long-lived asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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