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18. Share capital and additional paid-in capital (Tables)
 12 Months Ended
Dec. 31, 2019
Share Capital And Additional Paid-in Capital  
Share capital and additional paid-in capital
     Share capital    Additional paid-in capital    Total
             
Balance at December 31, 2016     27,982,570      282,328     28,264,898
Payment of Other reserve constitution - Share-bases compensation plan     -     71,222     71,222
Balance at December 31, 2017     27,982,570      353,550     28,336,120
Payment of Other reserve constitution - Share-bases compensation plan     (146)     16,441     16,295
             
Balance at December 31, 2018 and December 31, 2019     27,982,424      369,991     28,352,415