Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2013

Marketable Securities

Schedule of amortized cost and fair value for held-to-maturity securities by major security type

	June 30, 2013
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
Certificates of deposit	$	2,207,998	$	1,479	$	—	$	2,209,477
Municipal bonds	207,720		1,872		—		209,592
	$	2,415,718	$	3,351	$	—	$	2,419,069

	December 31, 2012
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Fair Value
Certificates of deposit	$	2,802,993	$	8,684	$	—		$	2,811,677
Municipal bonds	2,903,003		5,057		(30		)	2,908,030
	$	5,705,996	$	13,741	$	(30	)	$	5,719,707