Name:	hdy_CapitalizedCostOtherEquipmentCost
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The sum of the costs incurred, as of the balance sheet date, of unproved properties including acquisition costs, exploration costs, development costs and production costs.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Capitalized costs incurred which is expected to be incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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The expected costs to be incurred on unproved properties including acquisition costs, exploration costs, development costs, and production costs.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the depth, below seabed which is required to be drilled, of an exploration well.

No definition available.

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Data Type:	num:lengthItemType
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Represents the estimated amount of expenditure which is required to be incurred on exploration wells.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Represents the estimated amount of expenditure which is required to be incurred on each of the exploration wells.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the non-controlling participating interest of another entity by way of investment in oil and gas properties managed by the reporting entity.

No definition available.

Name:	hdy_MinorityInterestInOilAndGasProperties
Namespace Prefix:	hdy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the required expenditure on acquisition of 3D seismic.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	hdy_OilAndGasPropertiesAndProjectsLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the annual surface tax, per square kilometer on retained concession acreage, which is required to be paid.

No definition available.

Name:	hdy_OilAndGasPropertiesAnnualSurfaceTaxRequiredToBePaid
Namespace Prefix:	hdy_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

Represents the amount of annual training budget which is required to be established for oil industry personnel of regulatory authority.

No definition available.

Name:	hdy_OilAndGasPropertiesAnnualTrainingBudgetRequiredToBeEstablished
Namespace Prefix:	hdy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the contract area of oil and gas properties as percentage of original contract area, retained by the entity.

No definition available.

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

Represents the area of oil and gas properties to be relinquished, by the entity, as percentage of retained contract area.

No definition available.

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Namespace Prefix:	hdy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the contract area of oil and gas properties, retained by the entity.

No definition available.

Name:	hdy_OilAndGasPropertiesContractAreaRetained
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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

Represents the daily production of oil and gas barrels per day.

No definition available.

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the share of entity in net revenue, after recovery cost of operations.

No definition available.

Name:	hdy_OilAndGasPropertiesInterestInNetRevenuesAfterRecoveryCostOfOperationsPercentage
Namespace Prefix:	hdy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the share of regulatory authority in net revenue, after recovery cost of operations.

No definition available.

Name:	hdy_OilAndGasPropertiesInterestOfRegulatoryAuthorityInNetRevenuesAfterRecoveryCostOfOperationsPercentage
Namespace Prefix:	hdy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

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

Represents the percentage of aggregate revenue from production after royalty payment which will be split between regulatory authority and the entity.

No definition available.

Name:	hdy_OilAndGasPropertiesPercentageOfAggregateRevenueAfterRoyaltyPayment
Namespace Prefix:	hdy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the relinquishment of contract area of oil and gas properties, retained by the entity, as percentage of original contract area.

No definition available.

Name:	hdy_OilAndGasPropertiesRelinquishmentOfAreaRetainedAsPercentageOfOriginalContractArea
Namespace Prefix:	hdy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the period by which exploration period may be extended to allow the completion of the appraisal of any discovery made.

No definition available.

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

Represents the period by which exploration period may be extended to allow the completion of a well in process.

No definition available.

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

Represents the royalty interest to be paid to regulatory authority, as percentage of aggregate revenue from production.

No definition available.

Name:	hdy_OilAndGasPropertiesRoyaltyToBePaidAsPercentageOfAggregateRevenue
Namespace Prefix:	hdy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the share of regulatory authority in cost and profit oil.

No definition available.

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

Represents the area of 3D seismic which is required to be acquired.

No definition available.

Name:	hdy_OilAndGasPropertiesSquareKilometersOf3DSeismicRequiredToBeAcquired
Namespace Prefix:	hdy_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

Represents the working interest of regulatory authority in oil and gas properties.

No definition available.

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

Represents the number of portions into which survey work will be carried out.

No definition available.

Name:	hdy_OilAndGasServiceContracts3DSeismicSurveyRequiredToBeConductedNumberOfPortions
Namespace Prefix:	hdy_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the amount of contract.

No definition available.

Name:	hdy_OilAndGasServiceContractsInitialContractPrice
Namespace Prefix:	hdy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the area of 3D seismic for which survey work is to be conducted under the contract.

No definition available.

Name:	hdy_OilAndGasServiceContractsSquareKilometersOf3DSeismicSurveyRequiredToBeConducted
Namespace Prefix:	hdy_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

Represents capitalized costs incurred (excluded from amortization), as of the date of balance sheet, that are considered as exploration costs, other than geological and geophysical or G&G costs.

No definition available.

Name:	hdy_OtherExplorationCosts
Namespace Prefix:	hdy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

Cash outflow related to prospective investment deposits.

No definition available.

Name:	hdy_ProspectiveInvestmentDeposit
Namespace Prefix:	hdy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The charge against earnings that represents the reduction of the currently-stated financial value of prospective investment deposit.

No definition available.

Name:	hdy_WriteOffOfProspectiveInvestmentDeposit
Namespace Prefix:	hdy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 19

-Paragraph 59M

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The sum of the capitalized costs incurred during the period of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.4-10.(c)(7)(ii))

-URI http://asc.fasb.org/extlink&oid=21918352&loc=d3e511914-122862

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph c

-Subparagraph 3(ii)(A)

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The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 19

-Paragraph 59M

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 360

-Glossary Proved Properties

-URI http://asc.fasb.org/extlink&oid=6522428

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

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-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Glossary Properties

-URI http://asc.fasb.org/extlink&oid=21914647

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Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-Glossary Unproved Properties

-URI http://asc.fasb.org/extlink&oid=6527831

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Properties

-URI http://asc.fasb.org/extlink&oid=21914647

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 19

-Paragraph 59M

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The capitalized costs incurred during the period (excluded from amortization) in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test wells.

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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585