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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Weighted Average Shares and Adjusted Weighted Average Shares

The weighted average number of ordinary shares for the purposes of diluted earnings per share reconciles to the weighted average number of ordinary shares used in the calculation of basic earnings per share as follows:

 

     2017      2016  

Weighted average number of ordinary shares used in the calculation of basic earnings per share

      753,565        716,587  

Diluted impact of stock options

      -        6  

Weighted average number of ordinary shares used in the calculation of diluted earnings per share

                  753,565                    716,593