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Shares - Dividends (Details)
3 Months Ended 12 Months Ended
Jan. 03, 2020
CAD ($)
Oct. 04, 2019
CAD ($)
Jul. 05, 2019
CAD ($)
Apr. 05, 2019
CAD ($)
Jan. 04, 2019
CAD ($)
Dec. 31, 2019
$ / shares
$ / shares
Sep. 30, 2019
$ / shares
Jun. 30, 2019
$ / shares
Mar. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Dec. 31, 2019
$ / shares
$ / shares
Dec. 31, 2019
CAD ($)
$ / shares
Dec. 31, 2018
CAD ($)
Equity, Class of Treasury Stock [Line Items]                          
Per share           $ 0.04 $ 0.04 $ 0.02 $ 0.02 $ 0.02      
Total paid or payable | $   $ 1,028 $ 505 $ 503 $ 500             $ 3,066,000 $ 1,996,000
Annual aggregate dividend (in CAD per share)           $ 0.12         $ 0.12 $ 0.12  
Quarterly dividends paid (CAD per share)                     $ 0.16    
Subsequent event                          
Equity, Class of Treasury Stock [Line Items]                          
Total paid or payable | $ $ 1,030,000