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11. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
3 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment and related accumulated depreciation
    March 31,     December 31,  
    2013     2012  
    US$     US$  
Buildings and plant     62,981,432       62,825,600  
Machinery and equipment     80,391,535       79,997,837  
Office equipment     4,035,410       3,933,542  
Motor vehicles     2,921,989       2,980,011  
      150,330,366       149,736,990  
Less: Accumulated depreciation     (37,064,936 )     (34,746,182 )
Property, plant and equipment, net     113,265,430       114,990,808