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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Loss carryovers $ 11,168,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 9,852,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Gain 2,376,000us-gaap_DeferredTaxAssetsDeferredIncome 2,335,000us-gaap_DeferredTaxAssetsDeferredIncome
Stock option compensation expense 350,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 932,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Royalty 1,387,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 1,363,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Earnings in Unconsolidated Subsidiary 865,000us-gaap_DeferredTaxAssetsEquityMethodInvestments 798,000us-gaap_DeferredTaxAssetsEquityMethodInvestments
Severance    23,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments
Other 105,000us-gaap_DeferredTaxAssetsOther 107,000us-gaap_DeferredTaxAssetsOther
Valuation allowance (12,431,000)us-gaap_DeferredTaxAssetsValuationAllowance (12,545,000)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 3,820,000us-gaap_DeferredTaxAssetsGross 2,865,000us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Unrealized gain on derivative securities 238,000us-gaap_DeferredTaxLiabilitiesDerivatives 160,000us-gaap_DeferredTaxLiabilitiesDerivatives
MH-LLC investment 2,305,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfDomesticSubsidiaries 1,168,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfDomesticSubsidiaries
Exploration costs 845,000us-gaap_DeferredTaxLiabilitiesDeferredExpense 845,000us-gaap_DeferredTaxLiabilitiesDeferredExpense
Unrealized gains on marketable equity securities 152,000us-gaap_DeferredTaxLiabilitiesInvestments 688,000us-gaap_DeferredTaxLiabilitiesInvestments
Capitalized interest 277,000us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInterest   
Other 3,000us-gaap_DeferredTaxLiabilitiesOther 4,000us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 3,820,000us-gaap_DeferredIncomeTaxLiabilities 2,865,000us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liabilities