Marketable Securities

6 Months Ended

Jun. 30, 2011

Marketable Securities [Abstract]

Marketable Securities

(5) Marketable Securities   

The Company’s marketable securities consist of available-for-sale securities, which are carried at fair value, with unrealized gains and losses reported as a separate component of stockholders’ equity. Unrealized gains and losses are computed on the specific identification method. Realized gains, realized losses and declines in value judged to be other-than-temporary, are included in interest and other income, net. The cost of available-for-sale securities sold is based on the specific identification method and interest earned is included in interest and other income.

The cost and fair values of the Company’s available-for-sale marketable securities as of June 30, 2011, are as follows:

	Aggregate	Cost or Amortized	Net Unrealized
	Fair Value	Cost	Gains / (loss)
Auction rate securities	$            620,134	$                  700,000	$                  (79,866)
Government securities	17,879,998	17,862,012	17,986
Corporate debt securities	2,977,698	2,971,217	6,481
	$       21,477,830	$             21,533,229	$                  (55,399)

 The cost and fair values of the Company’s available-for-sale marketable securities as of December 31, 2010, are as follows:

	Aggregate Fair Value	Cost or Amortized Cost	Net Unrealized Gains / (loss)
Auction rate securities	$            578,643	$                  700,000	$                (121,357)
Government securities	17,053,041	17,043,856	9,185
Corporate debt securities	1,850,594	1,842,413	8,181
	$       19,482,278	$             19,586,269	$                (103,991)