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Share-based payment (Tables)
12 Months Ended
Dec. 31, 2023
Text block [abstract]  
Number and Weighted Average Exercise Prices ("WAEP") of, and Movements in Share Options
The following table illustrates the number and weighted average exercise prices (“WAEP”) of, and movements in share options during the year:
 
    
Number of
share options
    
WAEP
    
Number of
share options
    
WAEP
 
    
2022
    
2022
    
2023
    
2023
 
Outstanding at January 1 and December 31
     270,000      US$  21.11        270,000      US$  21.11  
  
 
 
       
 
 
    
Exercisable at December 31
     270,000      US$ 21.11        270,000      US$ 21.11  
  
 
 
       
 
 
    
Fair Value of Share Options and Assumptions
Date of grant of options
  
On July 29,
2014
Fair value at measurement date (US$)
   5.70 – 6.74
  
 
Share price (US$)
   21.11
Exercise price (US$)
   21.11
Expected volatility (%)
   47.4
Expected option life (years)
   3.5 – 5.5
Expected dividends (%)
   5.81
Risk-free interest rate (%)
   1.4 – 2.0