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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, 2017
Dec. 31, 2016
Cash and cash equivalents:    
Cash at banks $ 150,948 $ 92,730
Liquidity funds 66,033 215,807
Short – term investments 113,240 91,200
330,221 399,737
Other investments - current:    
Other investments - current 1,192,306 1,633,142
Other investments - Non-current:    
Other investments - non-current 128,335 249,719
Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member]    
Other investments - current:    
Other investments - current 437,406 782,029
Bonds and other fixed income [member]    
Other investments - current:    
Other investments - current 754,800 841,638
Other investments - Non-current:    
Other investments - non-current 123,498 248,049
Fund investments [member]    
Other investments - current:    
Other investments - current 9,475
Other investments [member]    
Other investments - current:    
Other investments - current 100
Other investments - Non-current:    
Other investments - non-current $ 4,837 $ 1,670