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Consolidated Statements of Changes in Shareholders' Equity - CAD ($)
$ in Thousands
Total
Common shares
Treasury shares
Additional paid-in capital
Deficit
Total
Noncontrolling interest
Beginning balance at Dec. 31, 2018 $ 150,215 $ 221,773 $ (11,702) $ 53,567 $ (113,917) $ 149,721 $ 494
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income and comprehensive income available to shareholders 37,133       36,878 36,878 255
Net income and comprehensive income 37,133       36,878 36,878 255
Dividends ($0.12 per share in 2019 and $0.16 in 2020) (3,066)       (3,066) (3,066)  
Exercise of stock options 1,953 3,248   (1,295)   1,953  
Conversion of convertible debentures 945 945       945  
Purchase of treasury shares (10,387)   (10,387)     (10,387)  
Stock-based compensation 3,825   6,178 (2,353)   3,825  
Distributions to (from) affiliates and joint venture partners (30)       250 250 (280)
Effect of change in presentation of NL Partnership (469)           (469)
Ending balance at Dec. 31, 2019 180,119 225,966 (15,911) 49,919 (79,855) 180,119 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income and comprehensive income available to shareholders 49,208       49,208 49,208  
Net income and comprehensive income 49,208       49,208 49,208  
Dividends ($0.12 per share in 2019 and $0.16 in 2020) (4,508)       (4,508) (4,508)  
Exercise of stock options 537 895   (358)   537  
Conversion of convertible debentures 38,066 38,066       38,066  
Share purchase programs (9,108) (9,863)   755   (9,108)  
Purchase of treasury shares (9,893)   (9,893)     (9,893)  
Stock-based compensation 4,022   7,802 (3,780)   4,022  
Ending balance at Dec. 31, 2020 $ 248,443 $ 255,064 $ (18,002) $ 46,536 $ (35,155) $ 248,443 $ 0