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Note 8 - Commitments and Contingencies (Details Textual)
$ in Millions
Mar. 31, 2017
USD ($)
Federal and State Value added Taxes Litigations [Member]  
Commitments And Contingencies [Line Items]  
Loss Contingency, Estimate of Possible Loss $ 55
Threat of Expropriation of Assets [Member] | BRAZIL  
Commitments And Contingencies [Line Items]  
Assets, Noncurrent 76
Threat of Expropriation of Assets [Member] | BRAZIL | Cash [Member]  
Commitments And Contingencies [Line Items]  
Restricted Cash 7
Amended Credit Agreement [Member]  
Commitments And Contingencies [Line Items]  
Guarantor Obligations, Maximum Exposure, Undiscounted 116
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 18
Restricted Cash Deposits [Member]  
Commitments And Contingencies [Line Items]  
Guarantor Obligations, Maximum Exposure, Undiscounted $ 50