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Note 9 - Revenue (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Line Items]      
Transaction price related to unsatisfied performance obligations expected period 1 year 1 year  
Unrecognized revenue from unsatisfied performance obligations $ 70 $ 70  
Unsatisfied performance obligations, expected to be recognized in 2018   10.00%  
Unsatisfied performance obligations, expected to be recognized in 2019   35.00%  
Unsatisfied performance obligations, expected to be recognized in 2020   30.00%  
Unsatisfied performance obligations, expected to be recognized in thereafter   25.00%  
Contract liabilities 45 $ 45 $ 37
Revenue recognized, contract liabilities 2 31  
Contract with customer, cash payments received for liabilities that have been deferred 24 32  
Other Current Assets And Trade Receivables [Member]      
Disaggregation Of Revenue [Line Items]      
Contract assets 4 4 3
Other Current Liabilities [Member]      
Disaggregation Of Revenue [Line Items]      
Contract liabilities, current 40 40 37
Other Long-Term Liabilities [Member]      
Disaggregation Of Revenue [Line Items]      
Contract liabilities, non-current $ 5 $ 5 $ 0
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