(5) Marketable Securities (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012
Aggregate Fair Value	$ 21,505,410	$ 21,505,410	$ 13,691,700
Cost or Amortized Cost	13,687,456	21,589,200
Net Unrealized Gains / (loss)	4,244	(83,790)
Auction Rate Securities Member
Aggregate Fair Value	489,999	611,082
Cost or Amortized Cost	500,000	700,000
Net Unrealized Gains / (loss)	(10,001)	(88,918)
Government Securities Member
Aggregate Fair Value	11,331,862	17,303,207
Cost or Amortized Cost	11,321,514	17,286,598
Net Unrealized Gains / (loss)	10,348	16,609
Corporate Debt Securities Member
Aggregate Fair Value	1,869,839	3,591,121
Cost or Amortized Cost	1,865,942	3,602,602
Net Unrealized Gains / (loss)	$ 3,897	$ (11,481)