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Intangible assets - computer software
12 Months Ended
Dec. 31, 2018
Statements [Line Items]  
Intangible assets - computer software [text block]
11.
Intangible assets - computer software
 
   Dec. 31, 2018  Dec. 31, 2017  Jan. 1, 2017 
 Cost         
 Balance, beginning of year$ 19,169 $ 16,998 $ 16,179 
 Additions 590  1,203  407 
 Effects of movement in exchange rates (1,202) 968  412 
 Balance, end of year 18,557  19,169  16,998 
           
 Accumulated amortization         
 Balance, beginning of year 13,594  10,384  7,320 
 Additions 1,793  2,541  2,882 
 Effects of movement in exchange rates (992) 669  182 
 Balance, end of year 14,395  13,594  10,384 
           
 Net book value$ 4,162 $ 5,575 $ 6,614