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Inventories
3 Months Ended
Mar. 31, 2012
Inventories
7.             Inventories
Inventories consist of the following:
 
   
March 31,
   
December 31,
 
   
2012
   
2011
 
Raw materials
  $ 5,035,600     $ 4,091,366  
Work-in-process
    2,000,603       1,503,565  
Finished goods
    2,044,120       1,707,552  
Total
  $ 9,080,323     $ 7,302,483  

 
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.