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OTHER LIABILITIES (Details Narrative) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Obligations Details Narrative Abstract |  |
Letter of credit and standby fees | $ 397 | $ 411

X
- References No definition available. + Details
Name: | DNN_DebtObligationsDetailsNarrativeAbstract
Namespace Prefix: | DNN_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | DNN_LetterOfCreditAndStandbyFees
Namespace Prefix: | DNN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration