Investments in Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2015

Marketable Securities [Abstract]

Investments Classified by Contractual Maturity Date [Table Text Block]

At March 31, 2015 and December 31, 2014, held-to-maturity investments included the following:

			Maturing						Maturing
	March 31, 2015		within 1 year		after 1 year through 3 years		December 31, 2014		within 1 year		after 1 year through 3 years
Cash/money accounts	$	82	$	82	$	—	$	204	$	204	$	—
US Treasury securities	1,283		105		1,178		1,070		105		965
Government agency securities	221		129		92		317		225		92
Total	$	1,586	$	316	$	1,270	$	1,591	$	534	$	1,057

Held-to-maturity Securities [Table Text Block]

At March 31, 2015 and December 31, 2014, held-to-maturity investments were recorded in the following accounts: 

	March 31, 2015		December 31, 2014
Other current assets	$	316	$	534
Other long-term assets	1,270		1,057
Total	$	1,586	$	1,591