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Earnings (losses) per share (Tables) | 12 Months Ended
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Dec. 31, 2018
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Summary of Basic and Diluted Earnings (Losses) per Share | Basic and diluted earnings (losses) per share is following analysed:
|  | 2018 |  |  | 2017 |
Weighted average number of ordinary shares |  |  | 54,853,045 |  |  |  | 54,853,045 |
Basic earnings (losses) per share |  |  | 0.61 |  |  |  | (0.55 | )
Diluted earnings (losses) per share |  |  | 0.61 |  |  |  | (0.55 | )

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