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CONSOLIDATED BALANCE SHEETS (USD $)
Sep. 30, 2014
Sep. 30, 2013
Current assets:    
Cash and cash equivalents $ 2,182,406us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,184,204us-gaap_CashAndCashEquivalentsAtCarryingValue
Investment in Oando Energy Resources 671,402us-gaap_AvailableForSaleSecuritiesEquitySecuritiesCurrent 563,525us-gaap_AvailableForSaleSecuritiesEquitySecuritiesCurrent
Deferred debt origination cost - short term 147,079us-gaap_DeferredFinanceCostsCurrentNet 0us-gaap_DeferredFinanceCostsCurrentNet
Prepaid expenses and other 246,922us-gaap_PrepaidExpenseAndOtherAssetsCurrent 228,881us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 3,247,809us-gaap_AssetsCurrent 1,976,610us-gaap_AssetsCurrent
Oil and gas concession fees 6,006,235erhe_OilAndGasConcessionFees 6,037,803erhe_OilAndGasConcessionFees
Furniture and equipment, net of accumulated depreciation of $368,587 and $303,303 at September 30, 2014 and 2013, respectively 206,273us-gaap_PropertyPlantAndEquipmentNet 202,364us-gaap_PropertyPlantAndEquipmentNet
Restricted certificate of deposit 0us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 2,186,182us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Deferred debt origination cost - long term 43,755us-gaap_DeferredFinanceCostsNoncurrentNet 0us-gaap_DeferredFinanceCostsNoncurrentNet
Income tax receivable 2,018,533us-gaap_IncomeTaxReceivable 2,018,533us-gaap_IncomeTaxReceivable
Prepaid expenses - long term 172,433us-gaap_OtherAssets 51,108us-gaap_OtherAssets
Total assets 11,695,038us-gaap_Assets 12,472,600us-gaap_Assets
Current liabilities:    
Accounts payable and accrued liabilities 379,639us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 983,293us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Convertible note payable, net of discount - short term 625,533us-gaap_ConvertibleNotesPayableCurrent 0us-gaap_ConvertibleNotesPayableCurrent
Derivative liability - short term 751,404us-gaap_DerivativeLiabilitiesCurrent 0us-gaap_DerivativeLiabilitiesCurrent
Total current liabilities 1,756,576us-gaap_LiabilitiesCurrent 983,293us-gaap_LiabilitiesCurrent
Convertible note payable, net of discount - long term 38,076us-gaap_ConvertibleLongTermNotesPayable 0us-gaap_ConvertibleLongTermNotesPayable
Derivative liability - long term 270,538us-gaap_DerivativeLiabilitiesNoncurrent 0us-gaap_DerivativeLiabilitiesNoncurrent
Total liabilities 2,065,190us-gaap_Liabilities 983,293us-gaap_Liabilities
Commitments and contingencies:      
Shareholders' equity:    
Preferred stock, par value $0.0001; authorized 10,000,000 shares; none issued and outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, par value $0.0001; authorized 3,000,000,000 shares; issued and outstanding 765,194,088 and 764,849,260 shares at September 30, 2014 and 2013, respectively 76,520us-gaap_CommonStockValue 76,485us-gaap_CommonStockValue
Additional paid-in capital 101,080,306us-gaap_AdditionalPaidInCapital 101,067,084us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive loss (678,598)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (786,475)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficits (90,848,380)us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage (88,867,787)us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage
Total shareholders' equity 9,629,848us-gaap_StockholdersEquity 11,489,307us-gaap_StockholdersEquity
Total liabilities and shareholders' equity $ 11,695,038us-gaap_LiabilitiesAndStockholdersEquity $ 12,472,600us-gaap_LiabilitiesAndStockholdersEquity