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Note 6 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Commitments And Contingencies [Line Items]    
Restricted Cash and Cash Equivalents, Noncurrent $ 37 $ 43
Federal and State Value added Taxes Litigations [Member]    
Commitments And Contingencies [Line Items]    
Loss Contingency, Estimate of Possible Loss 56  
Threat of Expropriation of Assets [Member] | BRAZIL    
Commitments And Contingencies [Line Items]    
Assets, Noncurrent 74  
Threat of Expropriation of Assets [Member] | BRAZIL | Cash [Member]    
Commitments And Contingencies [Line Items]    
Restricted Cash and Cash Equivalents, Noncurrent 7  
Amended Credit Agreement [Member]    
Commitments And Contingencies [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 118  
Bank Guarantees and Letters of Credit [Member]    
Commitments And Contingencies [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 6  
Surety Bond [Member]    
Commitments And Contingencies [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 18  
Restricted Cash Deposits [Member]    
Commitments And Contingencies [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 50