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Share-based compensation - Stock appreciation rights - Changes in SARs (Details)
 12 Months Ended
Dec. 31, 2024
$ / shares
shares
SARs granted during the year | shares 0
Weighted average exercise price granted during the year | $ / shares $ 0
SARs exercised during the year | shares (176,360)
Weighted average exercise price exercised during the year | $ / shares $ (4.28)
Stock Appreciation Rights (SARs) [Member]  
Balance, No. of Units (Beginning) | shares 176,360
Balance, Weighted average exercise price (Beginning) | $ / shares $ 4.28
Balance, No. of Units (Ending) (none of which are exercisable or convertible) | shares 0
Balance, Weighted average exercise price (Ending) | $ / shares $ 0