Note 6 - Available-for-Sale Investments (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

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

	Amortized cost				Fair value
	June 30, 2015		December 31, 2014		June 30, 2015		December 31, 2014
Bonds, notes and other securities:
U.S. government and agencies	$	505	$	759	$	505	$	759
Total short-term investments	$	505	$	759	$	505	$	759
Asset-backed securities	$	40	$	42	$	35	$	38
Total long-term investments	$	40	$	42	$	35	$	38

Investments Classified by Contractual Maturity Date [Table Text Block]

Less than one year	$505
Due in 1-5 years
Due in 5-10 years
Due after 10 years (1)	35
Total	$540

Schedule of Unrealized Loss on Investments [Table Text Block]

		June 30, 2015
		12 months or greater				Total
	Number of securities in a loss position	Fair value		Unrealized losses (1)		Fair value		Unrealized losses
Asset-backed securities	21	$	35	$	(4)	$	35	$	(4)
Total long-term investments	21	$	35	$	(4)	$	35	$	(4)

		December 31, 2014
		12 months or greater				Total
	Number of securities in a loss position	Fair value		Unrealized losses (1)		Fair value		Unrealized losses
Asset-backed securities	21	$	37	$	(4)	$	37	$	(4)
Total long-term investments	21	$	37	$	(4)	$	37	$	(4)