Note 7 - Income Taxes - Tax Years Subject to Examination (Details)	12 Months Ended
	Dec. 31, 2019
CANADA
Open Tax Year	2016 2017 2018 2019
CHINA
Open Tax Year	2014 2015 2016 2017 2018 2019
MEXICO
Open Tax Year	2010 2012 2013 2014 2015 2016 2017 2018 2019
NETHERLANDS
Open Tax Year	2018 2019
PORTUGAL
Open Tax Year	2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
UNITED STATES
Open Tax Year	2011 2014 2015 2016 2017 2018 2019