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OTHER LIABILITIES (Details Narrative) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Obligations Details Narrative Abstract
Letter of credit and standby fees	$ 397	$ 397

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Name:	DNN_DebtObligationsDetailsNarrativeAbstract
Namespace Prefix:	DNN_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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Name:	DNN_LetterOfCreditAndStandbyFees
Namespace Prefix:	DNN_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration