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Income Taxes (Details Textuals) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Loss carryforwards - federal $ 44,076,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic $ 20,247,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Loss carryforwards - state 43,270,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 41,379,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Enhanced oil recovery credit carryforwards 42,817,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness 14,974,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
Tax credit carryover 34,837,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 34,837,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Tax benefit not recorded to additional paid-in capital 13,500,000dnr_TaxBenefitNotRecordedToApic  
Valuation Allowance, Amount $ 0us-gaap_DeferredTaxAssetsValuationAllowance