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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current Assets:    
Cash and cash equivalents $ 8,381us-gaap_CashAndCashEquivalentsAtCarryingValue $ 5,570us-gaap_CashAndCashEquivalentsAtCarryingValue
Prepaid and other current assets 1,056us-gaap_PrepaidExpenseAndOtherAssetsCurrent 863us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total Current Assets 9,437us-gaap_AssetsCurrent 6,433us-gaap_AssetsCurrent
Property, plant and equipment, at cost:    
Property, plant and equipment 98,454us-gaap_PropertyPlantAndEquipmentGross 98,454us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation, depletion and impairment (65,809)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (65,724)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property, plant and equipment 32,645us-gaap_PropertyPlantAndEquipmentNet 32,730us-gaap_PropertyPlantAndEquipmentNet
Restricted cash 3,941us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 3,941us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Total Assets 46,023us-gaap_Assets 43,104us-gaap_Assets
Current Liabilities:    
Accounts payable 636us-gaap_AccountsPayableCurrent 796us-gaap_AccountsPayableCurrent
Accrued liabilities 1,812us-gaap_AccruedLiabilitiesCurrent 1,680us-gaap_AccruedLiabilitiesCurrent
Current portion of asset retirement obligations 197us-gaap_AssetRetirementObligationCurrent 196us-gaap_AssetRetirementObligationCurrent
Total Current Liabilities 2,645us-gaap_LiabilitiesCurrent 2,672us-gaap_LiabilitiesCurrent
Asset retirement obligations, net of current portion 4,063us-gaap_AssetRetirementObligationsNoncurrent 4,000us-gaap_AssetRetirementObligationsNoncurrent
Convertible loan, net of discount - related party 4,794us-gaap_ConvertibleDebtNoncurrent 4,345us-gaap_ConvertibleDebtNoncurrent
Other long-term liabilities and deferred credits 950us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent 950us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent
Total Liabilities 12,452us-gaap_Liabilities 11,967us-gaap_Liabilities
Commitments and Contingencies      
Stockholders' Equity:    
Common stock, 200,000,000 shares authorized, $.001 par value; Issued shares - 29,737,844 and 25,288,113, respectively Outstanding shares - 29,641,527 and 25,192,669, respectively 30us-gaap_CommonStockValue 25us-gaap_CommonStockValue
Paid-in capital 239,714us-gaap_AdditionalPaidInCapitalCommonStock 233,524us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (205,915)us-gaap_RetainedEarningsAccumulatedDeficit (202,154)us-gaap_RetainedEarningsAccumulatedDeficit
Less: Treasury stock (95,444 and 95,444 shares, respectively), at cost (258)us-gaap_TreasuryStockValue (258)us-gaap_TreasuryStockValue
Total Stockholders' Equity 33,571us-gaap_StockholdersEquity 31,137us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity $ 46,023us-gaap_LiabilitiesAndStockholdersEquity $ 43,104us-gaap_LiabilitiesAndStockholdersEquity