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(2) Bill and Hold (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended | 24 Months Ended | 48 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2013 T | Mar. 31, 2013 | Mar. 31, 2015 T | Mar. 31, 2014 T | May 31, 2016 | Dec. 31, 2013 T
Bill And Hold Inventory [Abstract] |  |  |  |  |  |
TonsOfCoalAgreedToStorePerCustomer | 145,000 |  |  | 250,000 |  |
MinimumStoragePeriod |  | 1 year |  |  |  |
MaximumStoragePeriod |  |  |  | 2 years |  |
undefined |  |  |  |  | 2 |
IncreaseDecreaseInCoalInStorage |  |  | 50,000 |  |  |
undefined | 0 |  |  |  |  |
RevenueFromBillAndHold (in Dollars) |  |  |  |  |  | $ 7.3
TonsCoalStoredFirstCustomerReportingDate |  |  |  |  |  | 300,000
TonsCoalStoredSecondCustomerReportingDate |  |  |  |  |  | 250,000

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

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- Definition Second customer for Bill and Hold. + References No definition available. + Details
Name: | hnrg_BillAndHoldSecond
Namespace Prefix: | hnrg_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase Decrease In Coal In Storage + References No definition available. + Details
Name: | hnrg_IncreaseDecreaseInCoalInStorage
Namespace Prefix: | hnrg_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum Storage Period + References No definition available. + Details
Name: | hnrg_MaximumStoragePeriod
Namespace Prefix: | hnrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum Storage Period + References No definition available. + Details
Name: | hnrg_MinimumStoragePeriod
Namespace Prefix: | hnrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue from the sale of coal plus the storage fee + References No definition available. + Details
Name: | hnrg_RevenueFromBillAndHold
Namespace Prefix: | hnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Tons of Coal Stored for First Customer at Reporting Date + References No definition available. + Details
Name: | hnrg_TonsCoalStoredFirstCustomerReportingDate
Namespace Prefix: | hnrg_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

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- Definition Tons of Coal Stored for Second Customer at Reporting Date + References No definition available. + Details
Name: | hnrg_TonsCoalStoredSecondCustomerReportingDate
Namespace Prefix: | hnrg_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum amount of coal stored at the mine per the agreement with the purchaser. + References No definition available. + Details
Name: | hnrg_TonsOfCoalAgreedToStorePerCustomer
Namespace Prefix: | hnrg_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

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- Definition Tons of Coal Agreed to Store Per Customer - Second Customer + References No definition available. + Details
Name: | hnrg_TonsOfCoalAgreedToStorePerCustomerSecondCustomer
Namespace Prefix: | hnrg_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration