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4. Inventories (Tables)
12 Months Ended
Dec. 31, 2013
Inventories Tables  
Inventories consist
    2012     2013  
  Materials   $ 720,113     $ 440,723  
Finished goods (including $489,400 and $304,500 held by customers at December 31, 2012 and 2013, respectively)     1,910,273       1,273,358  
Total   $ 2,630,386     $ 1,714,081