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Note 28 - Cash Flow Disclosures - Cash Flow Disclosures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]        
Inventories $ 311,459 $ (176,443) $ (804,415)  
Receivables and prepayments and Current tax assets (34,368) 30,144 (4,564)  
Trade receivables 428,326 (517,579) (259,375)  
Other liabilities (18,295) (22,984) 4,226  
Customer advances 16,844 5,976 17,039  
Trade payables (180,857) (57,066) 193,905  
Increase (decrease) in working capital 523,109 (737,952) (853,184)  
Income tax accruals less payments        
Tax accrued 202,452 229,207 (17,136)  
Taxes paid (395,869) (170,713) (176,853)  
Adjustments for income tax expense (193,417) 58,494 (193,989)  
Interest accruals less payments, net        
Interest accrued (4,616) (2,914) (20,534)  
Interest received 30,890 40,613 50,001  
Interest paid (30,655) (31,548) (17,917)  
Interest income (expense) (4,381) 6,151 11,550  
Cash at banks, liquidity funds and short - term investments 1,554,299 428,361 330,221  
Bank overdrafts (24) (1,644) (131)  
Total cash and cash equivalents if different from statement of financial position $ 1,554,275 $ 426,717 $ 330,090 $ 398,580