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Business Segment Information - external customers by geographic region (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Segment Information      
Gross revenues $ 63,689 $ 71,291 $ 59,432
Canada      
Business Segment Information      
Gross revenues 47,537 56,609 39,493
Africa      
Business Segment Information      
Gross revenues 3,974 3,971 3,358
Americas, excluding Canada      
Business Segment Information      
Gross revenues 1,541 5,263 8,877
Asia      
Business Segment Information      
Gross revenues 4,951 286 604
Europe      
Business Segment Information      
Gross revenues $ 5,686 $ 5,162 $ 7,100