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13. Financial assets at fair value through profit or loss
 12 Months Ended
Dec. 31, 2018
Financial assets at fair value through profit or loss [abstract]  
Financial assets at fair value through profit or loss
       12.31.18     12.31.17 
           
Current          
Government bonds                    3,285,799                  1,829,888
Money market funds                          95,751                  2,448,120
Total current                     3,381,550                  4,278,008