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Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended | 3 Months Ended | 24 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014
Revenue, Major Customer [Line Items] |  |  |  |  |
Error correction amount |  | $ 483,000 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount |  |  |
Description of error corrections | During the fourth quarter of 2014, we identified errors to the consolidated financial statements for the years 2011 - 2014 (and for all interim periods therein) related to operating costs. We were inappropriately reconciling parts and supplies inventory related to a parts and components agreement with one of our vendors and the error was discovered when we were comparing amounts for the fourth quarter of 2014. The effect of correcting these errors to the 2013 consolidated financial statements was to decrease net income by $731,000. The effect for 2011 and 2012 totaled $483,000 and is reflected as a reduction in beginning retained earnings. The effect for 2014 was to reduce fourth quarter net income by $334,000. |  |  |  |
Reduction of Net Income [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Error correction amount |  | 731,000 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = hnrg_ReductionOfNetIncomeMember | 334,000 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = hnrg_ReductionOfNetIncomeMember |  |
Reduction in Beginning Retained Earnings [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Error correction amount |  |  |  | $ 483,000 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = hnrg_ReductionInBeginningRetainedEarningsMember |
Sales Revenue, Goods, Net [Member] | Five Customers [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Percentage of total coal sales | 75.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = hnrg_FiveCustomersMember |  |  |  |
Sales Revenue, Goods, Net [Member] | Four Customers [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Percentage of total coal sales |  | 94.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = hnrg_FourCustomersMember |  |  |
Sales Revenue, Goods, Net [Member] | Customer One [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Percentage of total coal sales | 35.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = hnrg_CustomerOneMember | 39.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = hnrg_CustomerOneMember |  |  |
Sales Revenue, Goods, Net [Member] | Customer Two [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Percentage of total coal sales | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = hnrg_CustomerTwoMember | 29.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = hnrg_CustomerTwoMember |  |  |
Sales Revenue, Goods, Net [Member] | Customer Three [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Percentage of total coal sales | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = hnrg_CustomerThreeMember | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = hnrg_CustomerThreeMember |  |  |
Sales Revenue, Goods, Net [Member] | Customer Four [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Percentage of total coal sales | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = hnrg_CustomerFourMember | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = hnrg_CustomerFourMember |  |  |
Sales Revenue, Goods, Net [Member] | Customer Five [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Percentage of total coal sales | 8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = hnrg_CustomerFiveMember |  |  |  |
Coal Supply Commitment [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Coal supply commitment | 32,000,000 hnrg_CoalSupplyCommitment / us-gaap_SupplyCommitmentAxis = hnrg_CoalSupplyCommitmentMember |  |  |  |
Year that supply commitments end | 2024 |  |  |  |
Priced coal supply commitment | 14,000,000 hnrg_PricedCoalSupplyCommitment / us-gaap_SupplyCommitmentAxis = hnrg_CoalSupplyCommitmentMember |  |  |  |
Savoy [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Equity method investment ownership percentage | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = hnrg_SavoyMember |  |  |  | 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = hnrg_SavoyMember
Sunrise Energy [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Equity method investment ownership percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = hnrg_SunriseEnergyMember |  |  |  |
Minimum [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Discount rate | 5.50%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Estimated useful lives | P3Y |  |  |  |
Maximum [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Discount rate | 10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Estimated useful lives | P25Y |  |  |  |

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