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Share-based payments - Disclosure of reconciliation of BCEs (Details) - shares
 12 Months Ended 130 Months Ended
May 14, 2018
Mar. 15, 2018
Nov. 20, 2017
Jan. 23, 2017
Nov. 07, 2016
Dec. 31, 2024
Dec. 31, 2024
Total BCEs              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of instruments outstanding, beginning balance (in shares)           385,409  
Number of instruments issued (in shares)           0 530,652
Number of instruments lapsed (in shares)           (51,230)  
Number of instruments exercised (in shares)           (4,000)  
Number of instruments outstanding, ending balance (in shares)           330,179 330,179
Number of instruments exercisable (in shares)           245,962 245,962
Maximum number of shares to be issued if all conditions are met (in shares)           330,179 330,179
BCE-2016-1              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of instruments outstanding, beginning balance (in shares)           22,495  
Number of instruments issued (in shares)         84,000 0  
Number of instruments lapsed (in shares)           (3,699)  
Number of instruments exercised (in shares)           0  
Number of instruments outstanding, ending balance (in shares)           18,796 18,796
Number of instruments exercisable (in shares)           18,796 18,796
Maximum number of shares to be issued if all conditions are met (in shares)           18,796 18,796
BCE-2017-1              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of instruments outstanding, beginning balance (in shares)           67,000  
Number of instruments issued (in shares)       67,374   0  
Number of instruments lapsed (in shares)           0  
Number of instruments exercised (in shares)           0  
Number of instruments outstanding, ending balance (in shares)           67,000 67,000
Number of instruments exercisable (in shares)           41,735 41,735
Maximum number of shares to be issued if all conditions are met (in shares)           67,000 67,000
BCE-2017-2              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of instruments outstanding, beginning balance (in shares)           112,500  
Number of instruments issued (in shares)     150,000     0  
Number of instruments lapsed (in shares)           0  
Number of instruments exercised (in shares)           0  
Number of instruments outstanding, ending balance (in shares)           112,500 112,500
Number of instruments exercisable (in shares)           112,500 112,500
Maximum number of shares to be issued if all conditions are met (in shares)           112,500 112,500
BCE-2017-4              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of instruments outstanding, beginning balance (in shares)           67,373  
Number of instruments issued (in shares)     67,374     0  
Number of instruments lapsed (in shares)           0  
Number of instruments exercised (in shares)           0  
Number of instruments outstanding, ending balance (in shares)           67,373 67,373
Number of instruments exercisable (in shares)           33,686 33,686
Maximum number of shares to be issued if all conditions are met (in shares)           67,373 67,373
BCE-2017-5              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of instruments outstanding, beginning balance (in shares)           64,374  
Number of instruments issued (in shares)     67,374     0  
Number of instruments lapsed (in shares)           (26,687)  
Number of instruments exercised (in shares)           (4,000)  
Number of instruments outstanding, ending balance (in shares)           33,687 33,687
Number of instruments exercisable (in shares)           16,843 16,843
Maximum number of shares to be issued if all conditions are met (in shares)           33,687 33,687
BCE-2018-1              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of instruments outstanding, beginning balance (in shares)           11,980  
Number of instruments issued (in shares)   22,000       0  
Number of instruments lapsed (in shares)           0  
Number of instruments exercised (in shares)           0  
Number of instruments outstanding, ending balance (in shares)           11,980 11,980
Number of instruments exercisable (in shares)           11,980 11,980
Maximum number of shares to be issued if all conditions are met (in shares)           11,980 11,980
BCE 2018-3              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of instruments outstanding, beginning balance (in shares)           16,844  
Number of instruments issued (in shares) 33,687         0  
Number of instruments lapsed (in shares)           (16,844)  
Number of instruments exercised (in shares)           0  
Number of instruments outstanding, ending balance (in shares)           0 0
Number of instruments exercisable (in shares)           0 0
Maximum number of shares to be issued if all conditions are met (in shares)           0 0
BCE-2018-4              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of instruments outstanding, beginning balance (in shares)           16,843  
Number of instruments issued (in shares) 16,843         0  
Number of instruments lapsed (in shares)           0  
Number of instruments exercised (in shares)           0  
Number of instruments outstanding, ending balance (in shares)           16,843 16,843
Number of instruments exercisable (in shares)           8,422 8,422
Maximum number of shares to be issued if all conditions are met (in shares)           16,843 16,843
BCE-2018-5              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of instruments outstanding, beginning balance (in shares)           6,000  
Number of instruments issued (in shares) 22,000         0  
Number of instruments lapsed (in shares)           (4,000)  
Number of instruments exercised (in shares)           0  
Number of instruments outstanding, ending balance (in shares)           2,000 2,000
Number of instruments exercisable (in shares)           2,000 2,000
Maximum number of shares to be issued if all conditions are met (in shares)           2,000 2,000