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Note 7 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
BRAZIL    
Commitments And Contingencies [Line Items]    
Restricted Cash $ 6  
Federal and State Value added Taxes Litigations and Civil Litigation and Disputes with Former Employees [Member] | BRAZIL    
Commitments And Contingencies [Line Items]    
Loss Contingency, Estimate of Possible Loss 24  
Threat of Expropriation of Assets [Member] | BRAZIL    
Commitments And Contingencies [Line Items]    
Assets, Noncurrent 71  
Threat of Expropriation of Assets [Member] | BRAZIL | Cash [Member]    
Commitments And Contingencies [Line Items]    
Restricted Cash 6  
Amended Credit Agreement [Member]    
Commitments And Contingencies [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 79  
Restricted Cash 0 $ 6
Bank Guarantees and Letters of Credit [Member]    
Commitments And Contingencies [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 4  
Surety Bond [Member]    
Commitments And Contingencies [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 53  
Restricted Cash and Deposits [Member]    
Commitments And Contingencies [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 26