Investment in Available-for-Sale Securities (Tables)

3 Months Ended

Mar. 31, 2013

Available-For-Sale Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

The following is a summary of the Company’s investment in available-for-sale securities as of March 31, 2013:

	Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. federal agency securities	$	4,588	$	158	$	-		$	4,746
Municipal securities		894,753		5,248		(758	)		899,243
Certificates of deposit		1,380,624		9,201		(22,420	)		1,367,405
Corporate debt securities		180,606		4,007		-			184,613
Equity securities – ClearSign common stock		7,905		17,641		-			25,546
	$	2,468,476	$	36,255	$	(23,178	)	$	2,481,553

 The following is a summary of the Company’s investment in available-for-sale securities as of December 31, 2012:

	Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. federal agency securities	$	19,592	$	196	$	-		$	19,788
Municipal securities		1,154,888		2,882		(2,137	)		1,155,633
Certificates of deposit		1,193,494		8,734		(16,904	)		1,185,324
Corporate debt securities		285,524		4,164		(9,633	)		280,055
Equity securities – ClearSign common stock		7,905		9,485		-			17,390
	$	2,661,403	$	25,461	$	(28,674	)	$	2,658,190

Available-for-sale Securities [Table Text Block]

The cost and fair value of investments in available-for-sale securities, by contractual maturity, as of March 31, 2013, were as follows:

	Cost		Fair Value
Due within one year	$	714,278	$	697,034
Due after one year through three years		778,065		780,271
Due after three years		968,228		978,702
No maturity		7,905		25,546
	$	2,468,476	$	2,481,553