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Financial investments (Tables)
12 Months Ended
Dec. 31, 2017
Financial investments (Tables) [Abstract]  
Financial investments

7. Financial investments 

 

  

December 31,

 

 

  

2017

 

  

2016

 

Short-term investment

  

 

210,103

 

  

 

131,239

 

  

 

 

 

  

 

 

 

  

 

210,103

 

  

 

131,239