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Share based payments - Options outstanding and exercisable (vested) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
CAD ($)
item
$ / shares
Dec. 31, 2021
CAD ($)
item
Nov. 15, 2022
$ / shares
Dec. 31, 2020
item
Options outstanding and exercisable        
Weighted Average Exercise Price, Outstanding     $ 2.52  
Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 991,960 834,352   844,630
Weighted Average Remaining Life (Years) 2 years 10 months 9 days      
Weighted Average Exercise Price, Outstanding $ 4.95      
Number of Shares Issuable on Exercise, Exercisable | item 508,426      
Weighted Average Exercise Price, Exercisable $ 1.62      
Amount expensed as shared-based payment | $ $ 505 $ 212    
2.52 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 174,259      
Weighted Average Remaining Life (Years) 1 year 8 months 4 days      
Weighted Average Exercise Price, Outstanding $ 2.52      
Number of Shares Issuable on Exercise, Exercisable | item 143,704      
Weighted Average Exercise Price, Exercisable $ 1.68      
2.61 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 27,778      
Weighted Average Remaining Life (Years) 2 years 7 months 28 days      
Weighted Average Exercise Price, Outstanding $ 2.61      
Number of Shares Issuable on Exercise, Exercisable | item 27,778      
Weighted Average Exercise Price, Exercisable $ 2.66      
2.88 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 16,667      
Weighted Average Remaining Life (Years) 1 year 9 months      
Weighted Average Exercise Price, Outstanding $ 2.88      
Number of Shares Issuable on Exercise, Exercisable | item 16,667      
Weighted Average Exercise Price, Exercisable $ 1.75      
3.21 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 130,000      
Weighted Average Remaining Life (Years) 4 years 10 months 13 days      
Weighted Average Exercise Price, Outstanding $ 3.21      
Weighted Average Exercise Price, Exercisable $ 4.87      
3.24 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 55,556      
Weighted Average Remaining Life (Years) 1 year 1 month 20 days      
Weighted Average Exercise Price, Outstanding $ 3.24      
Number of Shares Issuable on Exercise, Exercisable | item 55,556      
Weighted Average Exercise Price, Exercisable $ 1.14      
4.38 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 30,000      
Weighted Average Remaining Life (Years) 4 years 5 months 23 days      
Weighted Average Exercise Price, Outstanding $ 4.38      
Weighted Average Exercise Price, Exercisable $ 4.48      
4.63 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 19,444      
Weighted Average Remaining Life (Years) 4 years 4 months 24 days      
Weighted Average Exercise Price, Outstanding $ 4.63      
Weighted Average Exercise Price, Exercisable $ 4.40      
4.90 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 40,000      
Weighted Average Remaining Life (Years) 4 years 5 months 8 days      
Weighted Average Exercise Price, Outstanding $ 4.90      
Weighted Average Exercise Price, Exercisable $ 4.44      
5.40 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 190,016      
Weighted Average Remaining Life (Years) 4 years 18 days      
Weighted Average Exercise Price, Outstanding $ 5.40      
Weighted Average Exercise Price, Exercisable $ 4.05      
5.76 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 19,444      
Weighted Average Remaining Life (Years) 4 years 3 months      
Weighted Average Exercise Price, Outstanding $ 5.76      
Weighted Average Exercise Price, Exercisable $ 4.25      
6.21 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 31,944      
Weighted Average Remaining Life (Years) 3 years 3 months 14 days      
Weighted Average Exercise Price, Outstanding $ 6.21      
Number of Shares Issuable on Exercise, Exercisable | item 10,648      
Weighted Average Exercise Price, Exercisable $ 3.29      
6.48 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 116,667      
Weighted Average Remaining Life (Years) 2 years 8 months 26 days      
Weighted Average Exercise Price, Outstanding $ 6.48      
Number of Shares Issuable on Exercise, Exercisable | item 116,667      
Weighted Average Exercise Price, Exercisable $ 2.74      
7.29 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 5,556      
Weighted Average Remaining Life (Years) 2 years 1 month 17 days      
Weighted Average Exercise Price, Outstanding $ 7.29      
Number of Shares Issuable on Exercise, Exercisable | item 2,778      
Weighted Average Exercise Price, Exercisable $ 2.13      
8.82 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 109,630      
Weighted Average Remaining Life (Years) 5 months 23 days      
Weighted Average Exercise Price, Outstanding $ 8.82      
Number of Shares Issuable on Exercise, Exercisable | item 109,630      
Weighted Average Exercise Price, Exercisable $ 0.48      
9.32 | Stock options        
Options outstanding and exercisable        
Number of Shares Issuable on Exercise, Outstanding | item 25,000      
Weighted Average Remaining Life (Years) 29 days      
Weighted Average Exercise Price, Outstanding $ 9.32      
Number of Shares Issuable on Exercise, Exercisable | item 25,000      
Weighted Average Exercise Price, Exercisable $ 0.08