Investment in and Advances to Affiliated Partnership (Details) (USD $)	12 Months Ended				0 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Feb. 29, 2012 UDT	Dec. 31, 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	(329,972)					329,972
Cash	33,479,519	29,848,798	22,102,634	13,401,429			278,475
Net property, plant, and equipment	23,318,296	13,346,457					651,032
Accrued expenses	$ 7,592,842	$ 5,540,163					$ 14,400