Note 13 - Restructuring Liabilities (Details Textual) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) Position	Mar. 31, 2018 USD ($)	Jun. 30, 2018 USD ($) Position
Restructuring Cost And Reserve [Line Items]
Restructuring Costs | $	$ 2	$ 2
Restructuring and Related Cost, Number of Positions Eliminated	40		75
United States and Canada [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated	35		35
Rest Of The World [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated	5		40
Manufacturing Service Positions [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated	30		40
Administrative and Sales Positions [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated	5		30
Research and Development Positions [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated	5		5
Restructuring costs and other [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Costs | $	$ 2		$ 4