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Condensed Consolidated Balance Sheets (USD $)
Jun. 30, 2013
Dec. 31, 2012
Current Assets:    
Cash and cash equivalents $ 5,325,813 $ 4,664,596
Prepaid and other current assets 401,579 708,228
Total Current Assets 5,727,392 5,372,824
Property, plant and equipment, at cost:    
Property, plant and equipment 99,919,035 100,058,667
Less accumulated depreciation, depletion and impairment (65,466,430) (65,318,921)
Net property, plant and equipment 34,452,605 34,739,746
Certificates of deposit, restricted 4,010,292 9,491,865
Total Assets 44,190,289 49,604,435
Current Liabilities:    
Accounts payable 764,448 1,331,888
Accrued liabilities 1,414,532 1,525,726
Note payable   5,000,000
Current portion of asset retirement obligations 887,257 1,160,378
Current portion of capital leases 40,431 112,140
Total Current Liabilities 3,106,668 9,130,132
Asset retirement obligations 3,455,798 3,337,679
Long-term debt 950,000 950,000
Long-term capital leases, less current portion 8,847 17,582
Total Liabilities 7,521,313 13,435,393
Shareholders' Equity:    
Common stock, 200,000,000 shares authorized, $.001 par value; 19,820,258 and 16,150,163 shares issued and outstanding, respectively 19,824 16,154
Paid-in capital 216,504,960 207,338,549
Accumulated deficit (179,846,390) (171,176,243)
Less: Treasury stock (3,813 shares), at cost (9,418) (9,418)
Total Shareholders' Equity 36,668,976 36,169,042
Total Liabilities and Shareholders' Equity 44,190,289 49,604,435
Commitments and contingencies (Note 10)