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(11) Ohio River Terminal (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | May 31, 2013 acre mi
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Ohio River Terminal [Abstract] |  |
Real Estate Investment Property, at Cost (in Dollars) | $ 2,836 | $ 2,800
Area of Real Estate Property (in Acres) |  | 17
OhioRiverTerminalMilePointLocation |  | 743.8

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- 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

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- Details
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Namespace Prefix: | hnrg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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