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17. Share capital and additional paid-in capital (Tables)
 12 Months Ended
Dec. 31, 2018
Share Capital And Additional Paidin Capital Tables Abstract  
Share capital and additional paid-in capital
     Share capital     Additional paid-in capital     Total 
             
Balance at December 31, 2016             18,197,583                  183,604             18,381,187
Payment of Other reserve constitution - Share-bases compensation plan (Note 25)                              -                    46,317                    46,317
Balance at December 31, 2017             18,197,583                  229,921             18,427,504
             
Payment of Other reserve constitution - Share-bases compensation plan (Note 25)                              -                    10,700                    10,700
Balance at December 31, 2018             18,197,583                  240,621             18,438,204