Note 15 - Revenue (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 61	$ 48
Contract liabilities, current	43	42
Revenue recognized, contract liabilities	34	34
Contract with customer, cash payments received for liabilities that have been deferred	47	36
Other Current Assets [Member]
Disaggregation Of Revenue [Line Items]
Contract assets	4	3
Other Current Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities, current	43	42
Other Long-Term Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities, non-current	$ 18	$ 6