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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
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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

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- Definition The amount of cash balances held at banks. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_i&doctype=Standard -URIDate 2017-03-09 + Details
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