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Note 3 - Selling, General and Administrative Expenses - Components of Selling, General and Administrative Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Selling, general and administrative expense [abstract]      
Services and fees $ 115,883 $ 153,773 $ 128,090
Labor cost 444,436 481,854 470,928
Depreciation of property, plant and equipment 26,814 18,524 16,968
Selling, general and administrative expenses, amortization of intangible assets 82,355 41,967 206,672
Depreciation of right-of-use assets 17,664 15,564
Commissions, freight and other selling expenses 310,815 441,442 491,555
Provisions for contingencies 11,957 28,565 23,498
Allowances for doubtful accounts 4,644 (16,256) 1,751
Taxes 63,234 110,876 71,110
Other 41,425 89,665 99,404
Total selling, general and administrative expense 1,119,227 1,365,974 1,509,976
Selling, general and administrative expenses, labor cost severance charges $ 61,200 $ 7,400 $ 10,200