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Note 18 - Cash and Cash Equivalents and Other Investments - Components of Cash and Cash Equivalents and Other Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Cash and cash equivalents:    
Cash at banks $ 118,314 $ 81,211
Liquidity funds 1,166,697 160,198
Short – term investments 269,288 186,952
Total cash and cash equivalents 1,554,299 428,361
Other investments - current:    
Other investments - current 210,376 487,734
Other investments - Non-current:    
Other investments - non-current 24,934 118,155
Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member]    
Other investments - current:    
Other investments - current 65,874 300,410
Bonds and other fixed income [member]    
Other investments - current:    
Other investments - current 144,502 187,324
Other investments - Non-current:    
Other investments - non-current 18,012 113,829
Other investments [member]    
Other investments - Non-current:    
Other investments - non-current $ 6,922 $ 4,326