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Components of Inventories (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Line Items]    
Purchased Parts and Components $ 934,828 $ 945,550
Work in Process 46,260 46,259
Finished Goods 231,593 259,112
Less: Reserve for Obsolescence (563,740) (563,740)
Net $ 648,941 $ 687,181