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INCOME TAXES (Details 4) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |
Deferred income tax assets not recognized | $ 116,819 | $ 112,728
Plant and Equipment |  |
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |
Deferred income tax assets not recognized | 4,744 | 7,344
Tax Losses - Capital |  |
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |
Deferred income tax assets not recognized | 66,873 | 66,783
Tax Losses - Operating |  |
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |
Deferred income tax assets not recognized | 42,635 | 35,904
Tax Credits |  |
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |
Deferred income tax assets not recognized | 1,126 | 1,126
Other Deductible Temporary Differences |  |
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |
Deferred income tax assets not recognized | $ 1,441 | $ 1,571

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