(5) Marketable Securities (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Aggregate Fair Value	$ 5,764,839	$ 10,530,942
Cost or Amortized Cost	5,762,386	10,524,732
Net Unrealized Gains / (loss)	2,453	6,210
Government Securities Member
Aggregate Fair Value	5,513,519	8,328,392
Cost or Amortized Cost	5,511,008	8,324,372
Net Unrealized Gains / (loss)	2,511	4,020
Corporate Debt Securities Member
Aggregate Fair Value	251,320	2,202,550
Cost or Amortized Cost	251,378	2,200,360
Net Unrealized Gains / (loss)	$ (58)	$ 2,190