(3) Marketable Securities (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Marketable securities, fair value, ending	$ 10,530,942	$ 21,505,410
Cost or Amortized Cost	10,524,732	21,589,200
Net Unrealized Gains / (loss)	6,210	(83,790)
Auction Rate Securities Member
Marketable securities, fair value, ending		611,082
Cost or Amortized Cost		700,000
Net Unrealized Gains / (loss)		(88,918)
Government Securities Member
Marketable securities, fair value, ending	8,328,392	17,303,207
Cost or Amortized Cost	8,324,372	17,286,598
Net Unrealized Gains / (loss)	4,020	16,609
Corporate Debt Securities Member
Marketable securities, fair value, ending	2,202,550	3,591,121
Cost or Amortized Cost	2,200,360	3,602,602
Net Unrealized Gains / (loss)	$ 2,190	$ (11,481)