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Inventories - Inventories (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Finished products $ 333,371 $ 602,753
Work-in-process 761,573 666,830
Raw materials 1,559,707 1,402,033
Net Inventories $ 2,654,651 $ 2,671,616