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Equity Investment in Savoy (Schedule of Costs Incurred) (Details) (Savoy [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Savoy [Member] |  |
Unproved property acquisition | $ 899 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / dei_LegalEntityAxis = hnrg_SavoyMember | $ 1,287 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / dei_LegalEntityAxis = hnrg_SavoyMember
Development | 1,224 hnrg_OilGasDevelopment / dei_LegalEntityAxis = hnrg_SavoyMember | 858 hnrg_OilGasDevelopment / dei_LegalEntityAxis = hnrg_SavoyMember
Exploration | 5,130 us-gaap_ExplorationExpense / dei_LegalEntityAxis = hnrg_SavoyMember | 7,061 us-gaap_ExplorationExpense / dei_LegalEntityAxis = hnrg_SavoyMember
Total | $ 7,253 us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities / dei_LegalEntityAxis = hnrg_SavoyMember | $ 9,206 us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities / dei_LegalEntityAxis = hnrg_SavoyMember

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- Definition Amount of costs incurred related to oil and gas property development activities, including capitalized costs and costs charged to expense. + References No definition available. + Details
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- Definition Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense. + References No definition available. + Details
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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64954-109465 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(15)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 15 -Article 4 + Details
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- Definition The cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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