Investments in Available-for-Sale Securities (Tables)

12 Months Ended

Dec. 31, 2015

Available-For-Sale Securities [Abstract]

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

The following is a summary of the Company’s investments in available-for-sale securities as of December 31, 2015:

			Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
U.S. federal agency securities	$	4,830	$	55	$	-	$	4,885
Municipal securities		492,237		789		(980)		492,046
Certificates of deposit		1,256,649		20,182		(14,865)		1,261,966
Corporate debt securities		17,173		115		-		17,288
	$	1,770,889	$	21,141	$	(15,845)	$	1,776,185

The following is a summary of the Company’s investments in available-for-sale securities as of December 31, 2014:

			Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
U.S. federal agency securities	$	49,739	$	68	$	(117)	$	49,690
Municipal securities		441,372		463		(966)		440,869
Certificates of deposit		1,395,990		22,904		(14,861)		1,404,033
Corporate debt securities		37,911		298		-		38,209
	$	1,925,012	$	23,733	$	(15,944)	$	1,932,801

Available-for-sale Securities [Table Text Block]

The cost and fair value of investments in fixed income available-for-sale debt securities, by contractual maturity, as of December 31, 2015, are as follows:

			Fair
	Cost		Value
Due within one year	$	1,004,435	$	1,018,896
Due after one year through three years		565,646		556,763
Due after three years		200,808		200,526
	$	1,770,889	$	1,776,185