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Net income per ordinary share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Basic and diluted number of shares
  December 31,
  2020 2019 2018
  Number of shares
       
       
   Weighted average number of ordinary shares for the purposes of basic and diluted net income per share 3,092,859 2,301,993 2,061,909