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Inventory
6 Months Ended
Jun. 30, 2011
Inventory [Abstract]  
Inventory
3. Inventory
Inventories are stated at the lower of cost or market. Cost is determined using the weighted average cost of raw materials, which approximates the first-in, first-out (FIFO) method, and includes allocations of manufacturing labor and overhead. Provisions are made to reduce potentially excess, obsolete or slow-moving inventories to their net realizable value. Inventories as of June 30, 2011 and December 31, 2010 consisted of the following:
                 
    June 30, 2011     December 31, 2010  
 
               
Raw materials and work-in-process
  $ 12,430,725     $ 11,817,579  
Finished goods
    4,158,460       6,348,490  
Reserve for excess and obsolete inventory
    (539,976 )     (350,664 )
 
           
 
               
 
  $ 16,049,209     $ 17,815,405