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(4) Investment in Savoy (Detail)	Mar. 31, 2013
Equity Interest in Savoy Energy LP	45.00%
Percentage of condensed balance sheet - Savoy Energy	100.00%

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- Definition

Our 45% interest in Savoy Energy LP

+ References

No definition available.

+ Details

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

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- Definition

Savoy's Financials Statements to the 100%

+ References

No definition available.

+ Details

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