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ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Sep. 21, 2013
Joint Interest Receivable And Allowance For Doubtful Accounts      
Accounts receivable - joint interest $ 29us-gaap_OilAndGasJointInterestBillingReceivablesCurrent $ 65us-gaap_OilAndGasJointInterestBillingReceivablesCurrent  
Allowance for doubtful accounts 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent  
Guinea concession      
Joint Interest Receivable And Allowance For Doubtful Accounts      
Accounts receivable - joint interest $ 29us-gaap_OilAndGasJointInterestBillingReceivablesCurrent
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= hdy_GuineaConcessionMember		 $ 65us-gaap_OilAndGasJointInterestBillingReceivablesCurrent
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= hdy_GuineaConcessionMember		  
Ownership interest sold (as a percent)     37.00%hdy_OilAndGasPropertiesOwnershipInterestSold
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= hdy_GuineaConcessionMember
Guinea concession | Dana      
Joint Interest Receivable And Allowance For Doubtful Accounts      
Ownership interest sold (as a percent) 23.00%hdy_OilAndGasPropertiesOwnershipInterestSold
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= hdy_GuineaConcessionMember
/ dei_LegalEntityAxis
= hdy_DanaPetroleumEAndPLimitedMember		    
Guinea concession | Tullow Guinea Ltd      
Joint Interest Receivable And Allowance For Doubtful Accounts      
Ownership interest sold (as a percent) 40.00%hdy_OilAndGasPropertiesOwnershipInterestSold
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= hdy_GuineaConcessionMember
/ dei_LegalEntityAxis
= hdy_TullowGuineaLtdMember