Note 18 - Changes in the Company's Benefit Obligation and Funded Status (Details) - Other Postretirement Benefit Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in the Company's Benefit Obligation and Funded Status [Line Items]
Projected benefit obligation at beginning of period	$ 74	$ 78
Interest cost	2	2	$ 3
Plan participants’ contributions	3	5
Actuarial loss	1	1
Benefit payments	(8)	(10)
Currency adjustments	2	(2)
Projected benefit obligation at end of period	74	74	$ 78
Underfunded status at end of period	$ (74)	$ (74)