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Condensed Consolidated Balance Sheets (USD $)
Mar. 31, 2013
Dec. 31, 2012
Current Assets:    
Cash and cash equivalents $ 4,350,219 $ 4,664,596
Prepaid and other current assets 452,961 708,228
Total Current Assets 4,803,180 5,372,824
Property, plant and equipment, at cost:    
Property, plant and equipment 100,031,128 100,058,667
Less accumulated depreciation, depletion and impairment (65,404,296) (65,318,921)
Net property, plant and equipment 34,626,832 34,739,746
Certificates of deposit, restricted 9,497,497 9,491,865
Total Assets 48,927,509 49,604,435
Current Liabilities:    
Accounts payable 1,134,536 1,331,888
Accrued liabilities 1,412,219 1,525,726
Note payable   5,000,000
Current portion of asset retirement obligations 1,003,049 1,160,378
Current portion of capital leases 78,980 112,140
Total Current Liabilities 3,628,784 9,130,132
Asset retirement obligations 3,375,957 3,337,679
Long-term debt 950,000 950,000
Long-term capital leases, less current portion 10,972 17,582
Total Liabilities 7,965,713 13,435,393
Shareholders' Equity:    
Common stock, 200,000,000 shares authorized, $.001 par value; 19,821,681 and 16,150,161 shares issued and outstanding, respectively 19,825 16,154
Paid-in capital 216,601,079 207,338,549
Accumulated deficit (175,649,690) (171,176,243)
Less: Treasury stock (3,813 shares), at cost (9,418) (9,418)
Total Shareholders' Equity 40,961,796 36,169,042
Total Liabilities and Shareholders' Equity 48,927,509 49,604,435
Commitments and contingencies (Note 11)