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14. POST-EMPLOYMENT BENEFITS (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfPostEmploymentBenefitLiabilityLineItems [Line Items]    
Post-employment benefits, beginning $ 1,832 $ 2,389
Experience loss (gain) adjustment 0 (428)
Post-employment benefits, ending 1,886 1,832
Post-employment benefits    
DisclosureOfPostEmploymentBenefitLiabilityLineItems [Line Items]    
Post-employment benefits, beginning 1,832 2,389
Accretion 57 82
Benefits paid (130) (137)
Experience loss (gain) adjustment 0 (580)
Foreign exchange 127 78
Post-employment benefits, ending $ 1,886 $ 1,832