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Inventories (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Inventories    
Finished products $ 1,409,115 $ 1,554,203
Work-in-process 1,594,900 1,599,761
Raw materials 3,242,773 3,191,018
Total $ 6,246,788 $ 6,344,982