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Note 11 - Sale of Blanket Mine Treasury Bills (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 16, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement Line Items [Line Items] |  |  |  |
Net gains (losses) on disposals of investments | $ 3,202 |  | $ 3,202 |

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- Definition The gains (losses) on disposals of investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_d&doctype=Standard -URIDate 2017-03-09 + Details
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