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Building Sale (Details) (USD $)
1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Jan. 31, 2011
UDT
Sale of Alabama facility
Jan. 13, 2011
UDT
Sale of Alabama facility
Dec. 31, 2010
UDT
Sale of Alabama facility
Building sale          
Sale proceeds       $ 1,250,000  
Net book value of the asset 23,318,296 13,346,457     384,000
Selling expenses     $ 38,000