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Investment in Affiliated Partnership (Details) (USD $)
1 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Feb. 29, 2012
UDT
Sep. 30, 2012
UDT
Dec. 31, 2011
UDT
Investment in Affiliated Partnership              
Ownership interest (as a percent)           26.32%  
Purchase of manufacturing building         $ 1,350,000    
Remaining ownership interest acquired (as a percent)         73.68%    
Non-controlling interests' portion of the excess of the amount paid for building over the carrying value         521,972    
Amounts related to UDT included in the condensed consolidated balance sheets              
Cash 31,155,308 29,848,798 28,688,332 22,102,634     278,475
Net property, plant, and equipment 19,401,437 13,346,457         651,032
Accrued expenses $ 5,631,124 $ 5,540,163         $ 14,400