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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2012
Property and Equipment [Abstract]  
Summary of property and equipment
   
2012
   
2011
 
Property and plant
 
$
24,783,378
   
$
18,742,014
 
Equipment and machinery
   
3,691,593
     
3,883,441
 
Office equipment and furniture
   
1,216,415
     
917,702
 
Motor vehicles
   
535,671
     
499,702
 
     
30,227,057
     
24,042,859
 
Less: accumulated depreciation
   
14,158,322
     
10,832,231
 
Property and equipment, net
 
$
16,068,735
   
$
13,210,628