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Note 9 - Revenue (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Line Items]    
Transaction price related to unsatisfied performance obligations expected period 1 year  
Remaining performance obligation $ 75  
Remaining performance obligations, expected to be recognized in 2018 30.00%  
Remaining performance obligations, expected to be recognized in 2019 30.00%  
Remaining performance obligations, expected to be recognized in 2020 20.00%  
Remaining performance obligations, expected to be recognized in thereafter 20.00%  
Contract liabilities $ 46 $ 37
Revenue recognized, contract liabilities 25  
Other Current Assets And Trade Receivables [Member]    
Disaggregation Of Revenue [Line Items]    
Contract assets 2 3
Other Current Liabilities [Member]    
Disaggregation Of Revenue [Line Items]    
Contract liabilities, current 38 37
Other Long-Term Liabilities [Member]    
Disaggregation Of Revenue [Line Items]    
Contract liabilities, non-current 8 $ 0
Cash Payments Received [Member]    
Disaggregation Of Revenue [Line Items]    
Contract liabilities $ 23  
Minimum [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue payment terms 30 days  
Interest for payment terms 1 year  
Maximum [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue payment terms 60 days