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Restricted Cash (Details Narrative) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Surety Bond [Member]
Represents the amount of reclamation obligations, which are required to be covered by surety performance bonding, as of the balance sheet date.	$ 27.8	$ 29.9

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- References

No definition available.

+ Details

Name:	urg_ReclamationBondingRequirement
Namespace Prefix:	urg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_SuretyBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: