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Note 19 - Borrowings - Maturity of Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Total borrowings $ 965,859 $ 840,236
Interest to be accrued (*) [1] 18,290 11,289
Total 984,149 851,525
Not later than one year [member]    
Statement Line Items [Line Items]    
Total borrowings 931,214 808,694
Interest to be accrued (*) [1] 14,512 6,461
Total 945,726 815,155
Later than one year and not later than two years [member]    
Statement Line Items [Line Items]    
Total borrowings 4,935 1,233
Interest to be accrued (*) [1] 1,212 1,172
Total 6,147 2,405
Later than two years and not later than three years [member]    
Statement Line Items [Line Items]    
Total borrowings 4,484 3,739
Interest to be accrued (*) [1] 1,203 1,161
Total 5,687 4,900
Later than three years and not later than four years [member]    
Statement Line Items [Line Items]    
Total borrowings 4,978 3,360
Interest to be accrued (*) [1] 1,190 1,142
Total 6,168 4,502
Later than four years and not later than five years [member]    
Statement Line Items [Line Items]    
Total borrowings 20,248 3,632
Interest to be accrued (*) [1] 174 1,116
Total 20,422 4,748
Later than five years [member]    
Statement Line Items [Line Items]    
Total borrowings 19,578
Interest to be accrued (*) [1] 237
Total 19,815
Finance lease liabilities [member]    
Statement Line Items [Line Items]    
Total borrowings 197 165
Finance lease liabilities [member] | Not later than one year [member]    
Statement Line Items [Line Items]    
Total borrowings 138 130
Finance lease liabilities [member] | Later than one year and not later than two years [member]    
Statement Line Items [Line Items]    
Total borrowings 59 35
Finance lease liabilities [member] | Later than two years and not later than three years [member]    
Statement Line Items [Line Items]    
Total borrowings
Finance lease liabilities [member] | Later than three years and not later than four years [member]    
Statement Line Items [Line Items]    
Total borrowings
Finance lease liabilities [member] | Later than four years and not later than five years [member]    
Statement Line Items [Line Items]    
Total borrowings
Finance lease liabilities [member] | Later than five years [member]    
Statement Line Items [Line Items]    
Total borrowings
Other borrowings [member]    
Statement Line Items [Line Items]    
Total borrowings 965,662 840,071
Other borrowings [member] | Not later than one year [member]    
Statement Line Items [Line Items]    
Total borrowings 931,076 808,564
Other borrowings [member] | Later than one year and not later than two years [member]    
Statement Line Items [Line Items]    
Total borrowings 4,876 1,198
Other borrowings [member] | Later than two years and not later than three years [member]    
Statement Line Items [Line Items]    
Total borrowings 4,484 3,739
Other borrowings [member] | Later than three years and not later than four years [member]    
Statement Line Items [Line Items]    
Total borrowings 4,978 3,360
Other borrowings [member] | Later than four years and not later than five years [member]    
Statement Line Items [Line Items]    
Total borrowings 20,248 3,632
Other borrowings [member] | Later than five years [member]    
Statement Line Items [Line Items]    
Total borrowings $ 19,578
[1] Includes the effect of hedge accounting.