Note 6 - Available-for-Sale Investments (Details) - Fair Value and Gross Unrealized Losses of Investments by Length of Time in Continuous Unrealized Loss Position $ in Millions		Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
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		$ 35	$ 37
12 months or Greater, Unrealized Losses	[1]	(4)	(4)
Total, Fair Value		35	37
Total, Unrealized Losses		$ (4)	$ (4)

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