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Note 19 - Borrowings - Borrowings by Currency and Rate (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Borrowings $ 34,645 $ 31,542
Borrowings 931,214 808,694
United States of America, Dollars | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Borrowings 19,120 19,461
Borrowings 187,872 200,448
United States of America, Dollars | Floating interest rate [member]    
Statement Line Items [Line Items]    
Borrowings 17,640 17,081
Euro Member Countries, Euro | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Borrowings 13,828 10,701
Borrowings 839 841
Euro Member Countries, Euro | Floating interest rate [member]    
Statement Line Items [Line Items]    
Borrowings 169 99
Other currency [member] | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Borrowings 8 194
Other currency [member] | Floating interest rate [member]    
Statement Line Items [Line Items]    
Borrowings 1,697 1,380
Borrowings 138 35
Mexico, Pesos | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Borrowings 412,719 391,318
Argentina, Pesos | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Borrowings 311,829 197,637
Argentina, Pesos | Floating interest rate [member]    
Statement Line Items [Line Items]    
Borrowings $ 1,041