Area of unpatented mining claims.

No definition available.

Name:	URRE_AreaOfUnpatentedMiningClaims
Namespace Prefix:	URRE_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Business combination comprised in cash used to fund operating activities.

+ References

No definition available.

+ Details

Name:	URRE_BusinessCombinationComprisedInCashUsedToFundOperatingActivitie
Namespace Prefix:	URRE_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Business Combination Consideration Options.

+ References

No definition available.

+ Details

Name:	URRE_BusinessCombinationConsiderationOptions
Namespace Prefix:	URRE_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Business consideration of listed and unlisted option.

+ References

No definition available.

+ Details

Name:	URRE_BusinessConsiderationOfListedAndUnlistedOption
Namespace Prefix:	URRE_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair Value Of Common Stock.

+ References

No definition available.

+ Details

Name:	URRE_FairValueOfCommonStock
Namespace Prefix:	URRE_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Issued consideration based upon opening share price.

+ References

No definition available.

+ Details

Name:	URRE_IssuedConsiderationBasedUponOpeningSharePrice
Namespace Prefix:	URRE_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Business Consideration Performance Shares.

+ References

No definition available.

+ Details

Name:	URRE_NumberOfBusinessConsiderationPerformanceShares
Namespace Prefix:	URRE_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares issued during period for settlement.

+ References

No definition available.

+ Details

Name:	URRE_NumberOfSharesIssuedDuringPeriodForSettlement
Namespace Prefix:	URRE_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares listed options.

+ References

No definition available.

+ Details

Name:	URRE_NumberOfSharesListedOptions
Namespace Prefix:	URRE_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of gross royalty.

+ References

No definition available.

+ Details

Name:	URRE_PercentageOfGrossRoyalty
Namespace Prefix:	URRE_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of interest hold indirectly.

+ References

No definition available.

+ Details

Name:	URRE_PercentageOfInterestHoldIndirectly
Namespace Prefix:	URRE_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of NSR royalty.

+ References

No definition available.

+ Details

Name:	URRE_PercentageOfNsrRoyalty
Namespace Prefix:	URRE_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Settled by issuance of shares value.

+ References

No definition available.

+ Details

Name:	URRE_SettledByIssuanceOfSharesValue
Namespace Prefix:	URRE_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460

+ Details

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

+ Details

Name:	us-gaap_CashAcquiredFromAcquisition
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 25
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=56951519&loc=d3e64954-109465

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10.(a)(15))
-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

+ Details

Name:	us-gaap_ExplorationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of cash paid for royalties during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

+ Details

Name:	us-gaap_PaymentsForRoyalties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares of stock issued during the period pursuant to acquisitions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesAcquisitions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares of stock issued during the period as part of a transaction to acquire assets that do not qualify as a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Value of shares of stock issued during the period as part of a transaction to acquire assets that do not qualify as a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=URRE_ColumbusSaltMarshMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=URRE_MesaSPAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=URRE_FirstAnniversaryDateOfClosingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=URRE_AnatoliaEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=URRE_TemrezliProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=URRE_AdditionalSharesTerminationPaymentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	URRE_AllExchangesAxis=URRE_NasdaqMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	URRE_AllExchangesAxis=URRE_ASXMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=URRE_AustralianMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=URRE_EnergyFuelsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=URRE_SectionsEightOfTownshipThirteenNorthMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=URRE_SectionsSeventeenOfTownshipThirteenjNorthMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=URRE_SevenMineralLeasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=URRE_LanceUraniumInsituRecoveryProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=URRE_ChurchrockProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=URRE_SectionFourOfTownshipSixteenNorthMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=URRE_RocaHondaProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=URRE_SectionSeventeenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Acquisitions and Disposals (Details Narrative) $ / shares in Units, $ in Thousands									12 Months Ended
	Nov. 16, 2016 USD ($) shares	Oct. 19, 2016 USD ($) shares	Jun. 26, 2016 a	Feb. 22, 2016 USD ($)	Nov. 10, 2015 $ / shares	Nov. 10, 2015 AUD / shares	Nov. 09, 2015 USD ($) $ / shares shares	Jun. 26, 2015 USD ($) a shares	Dec. 31, 2016 USD ($) a shares	Dec. 31, 2015 USD ($) shares	Sep. 21, 2016 a
Common stock issued for purchase of lithium properties									$ 132
Total consideration									17,368
Acquisition related costs										$ 3,048
Columbus Salt Marsh [Member]
Area of land \| a									11,220
Mesa SPA [Member]
Area of land \| a											9,900
Area of unpatented mining claims \| a											3,360
Percentage of acquisition of outstanding securities											100.00%
Percentage of NSR royalty											2.00%
Cash	$ 50	$ 50
Common stock issued for purchase of lithium properties, shares \| shares	100,000	100,000
Exploration expense									$ 300
Common stock issued for purchase of lithium properties									$ 278
Mesa SPA [Member] \| First Anniversary Date Of Closing [Member]
Common stock issued for purchase of lithium properties, shares \| shares									100,000
Anatolia Energy [Member]
Percentage of acquisition of outstanding securities							100.00%
Total consideration							$ 17,400
Business combination comprised in cash used to fund operating activities							1,500
Business consideration listed and unlisted option							$ 15,900
Common stock price per share \| $ / shares							$ 0.00548
Number of shares issued during period for acquisition \| shares							1,709,724
Number of shares listed options \| shares							266,742
Options \| shares							310,921
Number of performance shares \| shares							58,286
Acquisition related costs									$ 3,000
Settled by issuance of shares value									$ 700
Number of shares issued during period for settlement \| shares									79,841
Anatolia Energy [Member] \| Temrezli Project [Member]
Percentage of interest hold indirectly									100.00%
Anatolia Energy [Member] \| Additional Shares Termination Payments [Member]
Settled by issuance of shares value										$ 700
Number of shares issued during period for settlement \| shares										117,097
Anatolia Energy [Member] \| NASDAQ [Member]
Issued consideration based upon opening share price \| $ / shares					$ 9.00
Anatolia Energy [Member] \| ASX [Member]
Issued consideration based upon opening share price \| $ / shares					$ 8.38
Anatolia Energy [Member] \| ASX [Member] \| Australian [Member]
Issued consideration based upon opening share price \| AUD / shares						AUD 11.88
Energy Fuels [Member]
Cash								$ 2,500
Number of shares issued during period for acquisition \| shares								76,455
Fair value of common stock								$ 300
Subsequently sold value				$ 200
Payments for royalties								$ 5,000
Energy Fuels [Member] \| Sections 8 of Township 13 North [Member]
Area of land \| a								1,240
Energy Fuels [Member] \| Sections 17 of Township 13 North [Member]
Area of land \| a								3,382
Energy Fuels [Member] \| Seven Mineral Leases [Member] \| Lance Uranium In-situ Recovery Project [Member]
Area of land \| a			5,640
Percentage of gross royalty			4.00%
Churchrock Project [Member] \| Section 4 of Township 16 North [Member]
Area of land \| a			640
Roca Honda Project [Member] \| Section 17 [Member]
Percentage of gross royalty			4.00%