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2. Inventory (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Inventory Details    
Raw materials $ 440,924 $ 628,366
Work-in-progress 1,790,590 2,056,771
Finished goods 733,822 1,296,860
Total inventory $ 2,965,336 $ 3,981,997