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Salaries and other employee expenses (Details 1) - Restricted Stocks [Member] - Directors [Member] | 12 Months Ended
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Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Number of Shares, Outstanding at Beginning | 109,350 | 103,650 | 91,950
Number of Shares, Granted | 63,000 | 57,000 | 57,000
Number of Shares, Vested | (40,200) | (51,300) | (45,300)
Number of Shares, Outstanding at End | 132,150 | 109,350 | 103,650
Number of Shares, Expected to vest | 132,150 |  |
Weighted average grand date fair value Outstanding at beginning | $ / shares | $ 25.44 | $ 27.82 | $ 27.40
Weighted average grand date fair value, Granted | $ / shares | 11.54 | 22.68 | 28.70
Weighted average grand date fair value, Vested | $ / shares | 26.26 | 27.19 | 28.07
Weighted average grand date fair value, Outstanding at End | $ / shares | $ 18.56 | $ 25.44 | $ 27.82

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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 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of other equity instruments (ie other than share options) exercisable in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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