Name:	hdy_AdditionalConsiderationGrossExpenditureCapWellExplorationDrilling
Namespace Prefix:	hdy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the total depth of drilled well.

No definition available.

Name:	hdy_DrillingOperationsTotalDepthOfDrilledWell
Namespace Prefix:	hdy_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	duration

Represents further extension period for completion of well in process

No definition available.

Name:	hdy_FurtherExtensionPeriodForCompletionOfWellInProcess
Namespace Prefix:	hdy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents further extension period to allow the completion of an appraisal of any discovery made

No definition available.

Name:	hdy_FurtherExtensionPeriodToAllowCompletionOfAppraisalOfAnyDiscoveryMade
Namespace Prefix:	hdy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents minimum depth to be reached to satisfy work requirement.

No definition available.

Name:	hdy_MinimumDepthToBeReachedToSatisfyWorkRequirement
Namespace Prefix:	hdy_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	duration

Represents notice period required for further extension period for completion of well in process.

No definition available.

Name:	hdy_NoticePeriodRequiredForFurtherExtensionPeriodForCompletionOfWellInProcess
Namespace Prefix:	hdy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of exploration wells drilled.

No definition available.

Name:	hdy_NumberOfExplorationWellsDrilled
Namespace Prefix:	hdy_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The percentage interest in the investment of an oil and gas property.

No definition available.

Name:	hdy_OilAndGasPropertiesOwnershipInterest
Namespace Prefix:	hdy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the interest of the entity sold in the investment in oil and gas properties managed by the entity.

No definition available.

Name:	hdy_OilAndGasPropertiesOwnershipInterestSold
Namespace Prefix:	hdy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the maximum period of time over which current available liquidity could be exhausted.

No definition available.

Name:	hdy_OverduePeriodOfCurrentObligations
Namespace Prefix:	hdy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents time period for resumption of operations and to enter into necessary contracts.

No definition available.

Name:	hdy_PeriodForResumptionOfOperationsAndToEnterIntoNecessaryContracts
Namespace Prefix:	hdy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	hdy_StatusOfBusinessAbstract
Namespace Prefix:	hdy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the threshold gross expenditure cap related to future costs associated with well to be paid by the entity in the sale of an investment.

No definition available.

Name:	hdy_ThresholdGrossExpenditureCapForDeterminationOfBearingPortionOfShareOfCost
Namespace Prefix:	hdy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_LegalFees
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	us-gaap_LitigationCaseAxis=hdy_ForeignCorruptPracticesActInvestigationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=hdy_GuineaConcessionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CounterpartyNameAxis=hdy_TullowGuineaLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=hdy_DanaPetroleumEAndPLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=hdy_TullowGuineaLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: