(5) Marketable Securities

3 Months Ended

Mar. 31, 2013

Notes to Financial Statements

(5) 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 March 31, 2013, are as follows:

	Aggregate	Cost or Amortized	Net Unrealized
	Fair Value	Cost	Gains / (Loss)
Government securities	$             8,415,761	$             8,406,217	$                    9,544
Corporate debt securities	1,390,129	1,389,456	673
	$             9,805,890	$             9,795,673	$                  10,217

The cost and fair values of the Company’s available-for-sale marketable securities as of December 31, 2012, are as follows:

	Aggregate	Cost or Amortized	Net Unrealized
	Fair Value	Cost	Gains / (Loss)
Government securities	$             8,328,392	$             8,324,372	4,020
Corporate debt securities	2,202,550	2,200,360	2,190
	$           10,530,942	$           10,524,732	$                    6,210