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Building Sale (Details) (USD $)
0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
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 25,507,000 23,318,000   384,000
Selling expenses     $ 38,000