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Inventories
3 Months Ended
Mar. 31, 2013
Inventories
7.
Inventories
 
Inventories consist of the following:
 
   
March 31,
   
December 31,
 
   
2013
   
2012
 
Raw materials
  $ 5,990,124     $ 6,109,807  
Work-in-process
    1,947,084       777,056  
Finished goods
    2,010,753       1,396,609  
    Total
  $ 9,947,961     $ 8,283,472  

Inventories are stated at the lower of cost or market, with cost being determined using the first-in, first-out method. Work-in-process and finished goods inventories include materials, labor, and manufacturing overhead.