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Share-based payments - Share option changes and outstanding (Details)
12 Months Ended
Dec. 30, 2021
Options
Nov. 15, 2021
Options
Jun. 17, 2021
Options
May 21, 2021
Options
Mar. 11, 2021
Options
Dec. 22, 2020
Options
Dec. 15, 2020
Options
Nov. 16, 2020
Options
Aug. 17, 2020
Options
Jun. 08, 2020
Options
May 20, 2020
Options
Mar. 12, 2020
Options
Dec. 31, 2021
Options
$ / shares
Dec. 31, 2020
Options
$ / shares
Share-based payments                            
Number of share options outstanding in share-based payment arrangement at beginning of period | Options                         1,522,362 1,109,943
Granted | Options 105,071 24,500 1,000 555,464 12,000 11,500 10,000 84,900 2,900 80,000 481,405 16,550 698,035 687,255
Exercised | Options                         (79,208) (235,123)
Forfeited/expired | Options                         (48,593) (39,713)
Number of share options outstanding in share-based payment arrangement at end of period | Options                         2,092,596 1,522,362
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period | $ / shares                         $ 14.05 $ 10.51
Granted | $ / shares                         22.21 18.46
Exercised | $ / shares                         9.72 10.42
Forfeited/expired | $ / shares                         15.46 12.80
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period | $ / shares                         $ 16.90 $ 14.05