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Net income per ordinary share (Tables)
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Basic and diluted number of shares
    2018     2017     2016  
    Number of shares  
                   
                   
Weighted average number of ordinary shares for the purposes of basic and diluted net income per share     2,061,909       2,061,909       2,061,909