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Basis for preparation, consolidation and accounting policies (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |
Useful lives or depreciation rates, investment property, cost model | 20 years |
Workers' profit sharing rate | 8.00% |
Qualifying asset, description | A qualifying asset is one whose value is greater than US$5 million and requires a longer period to 12 months to get ready for its intended use. |
Applicable tax rate | 32.00% | 32.00%
Financial assets measured at fair value through other comprehensive income | $ 20.6 |
OSINERGMIN [Member] |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |
Contribution rate on sales invoice value | 0.14% | (0.15%)
OEFA [Member] |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |
Contribution rate on sales invoice value |  | (0.11%)

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- Definition The amount of financial assets that are measured at fair value through other comprehensive income. A financial asset shall be measured at fair value through other comprehensive income if both of the following conditions are met: (a) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and (b) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_h&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The useful lives or depreciation rates used for investment property. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_79_b&doctype=Standard -URIDate 2018-03-16 + Details
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