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Note 23 - Equity-settled Share-based Expense - Other Equity Share Units Granted (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Restricted stock units (RSUs) [member] |  |
Statement Line Items [Line Items] |  |
Grants | 88,494 | 80,234
RSU dividend reinvestments | 7,324 | 3,505
Restricted stock units (RSUs) [member] | January 11, 2016 [member] |  |
Statement Line Items [Line Items] |  |
Grants | 60,645 | 60,645
Restricted stock units (RSUs) [member] | March 23, 2016 [member] |  |
Statement Line Items [Line Items] |  |
Grants | 10,965 | 10,967
Restricted stock units (RSUs) [member] | June 8, 2016 [member] |  |
Statement Line Items [Line Items] |  |
Grants | 5,117 | 5,117
Restricted stock units (RSUs) [member] | January 19, 2017 [member] |  |
Statement Line Items [Line Items] |  |
Grants | 4,443 |
Performance share units (PSUs) [member] |  |
Statement Line Items [Line Items] |  |
Grants | 324,694 | 306,920
Performance share units (PSUs) [member] | January 11, 2016 [member] |  |
Statement Line Items [Line Items] |  |
Grants | 242,579 | 242,579
Performance share units (PSUs) [member] | March 23, 2016 [member] |  |
Statement Line Items [Line Items] |  |
Grants | 43,871 | 43,871
Performance share units (PSUs) [member] | June 8, 2016 [member] |  |
Statement Line Items [Line Items] |  |
Grants | 20,470 | 20,470
Performance share units (PSUs) [member] | January 19, 2017 [member] |  |
Statement Line Items [Line Items] |  |
Grants | 17,774 |

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement as a result of dividends being re-invested. + References No definition available. + Details
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Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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