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(1) Summary of Significant Accounting Policies (Details)	Mar. 31, 2014
Accounting Policies [Abstract]
EquityInterestinSELLP	45.00%
Equity Interest in SELLC	50.00%

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- Definition

Equity Interest in SELLC

+ References

No definition available.

+ Details

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- Definition

Our 45% interest in Savoy Energy LP

+ References

No definition available.

+ Details

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Namespace Prefix:	hnrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

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