(4) Fair Value Using Significant Unobservable Inputs (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2012 Level 3	Jun. 30, 2011 Level 3
Auction Rate Securities
Beginning Balance		$ 611,082	$ 611,082	$ 578,643
Total unrealized gains in accumulated other comprehensive loss			53,917	41,491
Securities called by issuer	(100,000)	(200,000)	(200,000)	0
Ending Balance	$ 464,999	$ 464,999	$ 464,999	$ 620,134