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16. OTHER LIABILITIES (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Details Narrative
Letter of credit and standby fees	$ 317	$ 363

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- References

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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