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Basis for preparation, consolidation and accounting policies (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
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%)