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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Accumulated Other Comprehensive Income Loss |  |  |
Cumulative foreign currency translation | $ 413 | $ 410 | $ 403
Gross unamortized experience gain - post employment liability | 1,847 | 983 | 983
Tax effect unamortized experience gain - post employment liability | (485) | (259) | (259)
Accumulated other comprehensive income | $ 1,775 | $ 1,134 | $ 1,127

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