XML 16 R33.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Ohio River Terminal (Details) (Ohio River Terminal [Member], USD $) In Millions, unless otherwise specified | Sep. 30, 2014 mi acre | May 31, 2013
--- | --- | ---
Ohio River Terminal [Member] |  |
Terminal purchased |  | $ 2.8
Secured area available | 17 |
Ohio River terminal mile point location | 743.8 |

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