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Plant and Equipment (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Aug. 31, 2011
May 31, 2011
Plant and Equipment          
Plant construction in-process $ 78,000 $ 6,279,000      
Plant and equipment at cost 67,175,000 81,906,000      
Less accumulated depreciation (21,068,000) (25,837,000)      
Net Book Value 46,185,000 62,348,000      
Total depreciation expense on plant and equipment 8,589,000 8,322,000 7,998,000    
Plant And Equipment (Textual) [Abstract]          
Deposit non refundable         1,000,000
Remaining amount paid to complete purchase       4,500,000  
Gain on sale of plant and equipment $ 1,058,000