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Inventories
6 Months Ended
Jun. 30, 2011
Inventories [Abstract]  
Inventories
4.   Inventories
 
    Inventories are valued at the lower of cost or market value. Cost is determined using the first-in first-out method (FIFO).
 
    Inventories consist of the following:
                 
    June 30, 2011     December 31, 2010  
Finished products
  $ 140,906     $ 80,329  
Work-in-process
    1,033,491       857,044  
Raw materials
    1,614,012       1,607,827  
 
           
Net inventories
  $ 2,788,409     $ 2,545,200