Note 14 - Revenue (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 48	$ 35
Contract liabilities, current	34	29
Revenue recognized, contract liabilities	34
Contract with customer, cash payments received for liabilities that have been deferred	36
Other Current Assets And Trade Receivables [Member]
Disaggregation Of Revenue [Line Items]
Contract assets	3	2
Other Current Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities, current	42	35
Other Long-Term Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities, non-current	$ 6	$ 0