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Ohio River Terminal (Details) (Ohio River Terminal [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2014 mi acre | May 31, 2013
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Ohio River Terminal [Member] |  |
Terminal purchased |  | $ 2.8 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = hnrg_OhioRiverTerminalMember
Secured area available | 17 us-gaap_AreaOfRealEstateProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = hnrg_OhioRiverTerminalMember |
Ohio River terminal mile point location | 743.8 hnrg_OhioRiverTerminalMilePointLocation / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = hnrg_OhioRiverTerminalMember |

X
- Definition Ohio River Mile Marker Location + References No definition available. + Details
Name: | hnrg_OhioRiverTerminalMilePointLocation
Namespace Prefix: | hnrg_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant