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Inventories (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Inventories    
Finished products $ 1,554,203 $ 804,049
Work-in-process 1,599,761 1,652,708
Raw materials 3,191,018 2,023,172
Total $ 6,344,982 $ 4,479,929