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3. Inventory (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Inventory Details    
Raw materials $ 1,716,760 $ 2,077,779
Work-in-progress 164,236 1,672,957
Finished goods 2,527,436 805,044
Total inventory $ 4,408,432 $ 4,555,780