Note 21 - Financial Instruments (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 2 [Member]
Long-term Debt, Fair Value	$ 377	$ 348
Forward Contracts [Member]
Gross fair value of foreign currency	10	7
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative Asset, Notional Amount	647	$ 534
Designated as Hedging Instrument [Member]
Derivatives Hedging Instruments	$ 0