Note 6 - Available-for-Sale Investments (Details) - Fair Value and Gross Unrealized Losses of Investments by Length of Time in Continuous Unrealized Loss Position (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Fair Value and Gross Unrealized Losses of Investments by Length of Time in Continuous Unrealized Loss Position [Abstract]
Number of Securities in A Loss Position	21		21
12 months or Greater, Fair Value	$ 37		$ 37
12 months or Greater, Unrealized Losses	(4)	[1]	(4)	[1]
Total, Fair Value	37		37
Total, Unrealized Losses	$ (4)		$ (4)

[1] Unrealized losses in securities less than 12 months were not significant.