(4) Schedule Of Fair Value Assets Measured On Recurring Basis (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Cash equivalents:
Money market funds	$ 6,452,560	$ 8,129,960
Total cash equivalents	6,452,560	8,129,960
Marketable securities:
Corporate debt and government securities	16,622,687	20,894,328
Auction rate securities	464,999	611,082
Total marketable securities	17,087,686	21,505,410
Total assets measured at fair value	23,540,246	29,635,370
Level 1
Cash equivalents:
Money market funds	6,452,560	8,129,960
Total cash equivalents	6,452,560	8,129,960
Marketable securities:
Total assets measured at fair value	6,452,560	8,129,960
Level 2
Marketable securities:
Corporate debt and government securities	16,622,687	20,894,328
Total marketable securities	16,622,687	20,894,328
Total assets measured at fair value	16,622,687	20,894,328
Level 3
Marketable securities:
Auction rate securities	464,999	611,082	620,134	578,643
Total marketable securities	464,999	611,082
Total assets measured at fair value	$ 464,999	$ 611,082