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12. Segment Information (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenues        
India $ 11,520,882 $ 2,211,109 $ 23,062,075 $ 4,524,806
North America 35,831,627 42,068,757 43,710,648 83,950,836
Other            
Total revenues 47,352,509 44,279,866 66,772,723 88,475,642
Cost of goods sold        
India 8,878,236 2,426,783 19,633,011 4,834,372
North America 34,724,006 43,874,023 43,141,731 87,920,722
Other            
Total cost of goods sold 43,602,242 46,300,806 62,774,742 92,755,094
Gross profit/(loss)        
India 2,642,646 (215,674) 3,429,064 (309,566)
North America 1,107,621 (1,805,266) 568,917 (3,969,886)
Other            
Total gross profit/(loss) $ 3,750,267 $ (2,020,940) $ 3,997,981 $ (4,279,452)