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Note 2 - Cost of Sales - Components of Cost of Sales (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Cost of Sales [Abstract]      
Inventories at the beginning of the year $ 2,265,880 $ 2,524,341 $ 2,368,304
Increase in inventory due to business combinations 199,589 52,966
Raw materials, energy, consumables and other 1,545,688 2,709,629 3,400,396
Services and fees 154,976 222,415 275,130
Labor cost 757,359 870,261 855,040
Depreciation of property, plant and equipment 503,725 428,791 432,497
Amortization of intangible assets 8,121 5,948 8,220
Depreciation of right-of-use assets 40,127 28,727
Maintenance expenses 107,764 284,758 185,782
Allowance for obsolescence 35,809 29,138 25,457
Taxes 45,162 100,738 133,308
Other 59,790 115,663 119,507
Cost of sales including discontinued operations 3,458,110 4,849,034 5,435,337
Less: Inventories at the end of the year (1,636,673) (2,265,880) (2,524,341)
Cost of sales 4,087,317 5,107,495 5,279,300
Cost of sales, labor cost severance charges $ 81,300 $ 17,200 $ 15,000