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Inventories
6 Months Ended
Jun. 30, 2013
Inventories
7.             Inventories
 
Inventories consist of the following:
 
   
June 30,
 
December 31,
   
2013
 
2012
Raw materials
  $ 6,160,860     $ 6,109,807  
Work-in-process
    2,016,882       777,056  
Finished goods
    2,180,056       1,396,609  
Total
  $ 10,357,798     $ 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.