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Inventories
9 Months Ended
Sep. 30, 2011
Inventories [Abstract] 
Inventories
3. Inventories
Inventories consisted of the following:
                 
    December 31,     September 30,  
    2010     2011  
            (Unaudited)  
Purchased materials
  $ 1,073,360     $ 1,555,991  
Finished goods
    1,433,645       1,724,310  
Reserve
    (291,756 )     (298,674 )
 
           
 
  $ 2,215,249     $ 2,981,627