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16. Property, Plant, and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Table Text Block]
    2012     2011  
    US$     US$  
Buildings and plant     62,825,600       71,761,419  
Machinery and equipment     79,997,837       79,153,189  
Office equipment     3,933,542       2,418,688  
Motor vehicles     2,980,011       4,236,268  
      149,736,990       157,569,564  
Less: Accumulated depreciation     (34,746,182 )     (28,829,927 )
Property, plant and equipment, net     114,990,808       128,739,637