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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating losses (NOL) carryover $ 34,657us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 33,973us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Depletion carryover 3,020us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 3,020us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Share based compensation 120us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 48us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Deferred book liabilities 1us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 1us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Debt and lease obligations 205HKNI_DeferredTaxAssetsDebtAndLeaseObligations  
Loan origination fees   60us-gaap_DeferredTaxAssetsDeferredIncome
Book vs. tax basis in investments 24,000us-gaap_DeferredTaxAssetsInvestments 20,683us-gaap_DeferredTaxAssetsInvestments
Capital loss carryover 763us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 2,688us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Property and equipment 5,024us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment  
Total gross deferred tax assets 67,790us-gaap_DeferredTaxAssetsGross 60,473us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Property and equipment   (824)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Net deferred tax assets 67,790HKNI_DeferredTaxAssetsLiabilitiesGross 59,649HKNI_DeferredTaxAssetsLiabilitiesGross
Less valuation allowances (67,790)us-gaap_DeferredTaxAssetsValuationAllowance (59,649)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax liabilities, net of valuation allowance $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet