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Commitments and Contingencies (Details) (USD $)
12 Months Ended
Sep. 30, 2014
sqft
Sep. 30, 2013
Operating Leases, Future Minimum Lease Payments [Abstract]    
2015 $ 129,027us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent  
2016 131,638us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears  
2017 110,968us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears  
Operating Leases, Total 371,633us-gaap_OperatingLeasesFutureMinimumPaymentsDue  
JDZ 5 [Member]    
Operating Leased Assets [Line Items]    
Working interest awarded in mining concessions (in hundredths) 15.00%erhe_WorkingInterestAwardedInMiningConcessions
/ us-gaap_LitigationStatusAxis
= erhe_Jdz5Member
 
JDZ 6 [Member]    
Operating Leased Assets [Line Items]    
Working interest awarded in mining concessions (in hundredths) 15.00%erhe_WorkingInterestAwardedInMiningConcessions
/ us-gaap_LitigationStatusAxis
= erhe_Jdz6Member
 
Domestic [Member]    
Operating Leased Assets [Line Items]    
Base rent payment 9,825us-gaap_OperatingLeasesRentExpenseMinimumRentals
/ us-gaap_StatementGeographicalAxis
= country_US
 
Area of office space (in sq. ft.) 5,200us-gaap_AreaOfRealEstateProperty
/ us-gaap_StatementGeographicalAxis
= country_US
 
Lease expenses 117,895us-gaap_LeaseAndRentalExpense
/ us-gaap_StatementGeographicalAxis
= country_US
123,561us-gaap_LeaseAndRentalExpense
/ us-gaap_StatementGeographicalAxis
= country_US
Lease expiration date Jul. 31, 2017  
Foreign [Member]    
Operating Leased Assets [Line Items]    
Lease expenses $ 168,427us-gaap_LeaseAndRentalExpense
/ us-gaap_StatementGeographicalAxis
= erhe_OtherThanUnitesStatesMember
$ 181,133us-gaap_LeaseAndRentalExpense
/ us-gaap_StatementGeographicalAxis
= erhe_OtherThanUnitesStatesMember
Foreign [Member] | Minimum [Member]    
Operating Leased Assets [Line Items]    
Operating leases, term 6 months  
Foreign [Member] | Maximum [Member]    
Operating Leased Assets [Line Items]    
Operating leases, term 6 years