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Financial investments (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Text block1 [abstract]    
Financial investments


     March 31, 2018      December 31, 2017  

Short-term investment

      —          210,103  
  

 

 

     

 

 

  
     —        210,103  
  

 

 

     

 

 

  
Financial investments

 

     December 31,  
     2017      2016  

Short-term investment

      210,103        131,239  
  

 

 

     

 

 

  
     210,103        131,239