Number Of Common Stock Shares Issued During Period For Settlement Of Debt.

No definition available.

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

- Definition

Stock Issued During Period Shares Issued For Settlement Of Interest Expenses.

+ References

No definition available.

+ Details

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

- Definition

Stock Issued During Period Value Issued For Settlement Of Interest Expenses.

+ References

No definition available.

+ Details

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

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: 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)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

+ Details

Name:	us-gaap_CommonStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

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+ Details

Name:	us-gaap_DebtConversionOriginalDebtAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ 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 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

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-Paragraph 1

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.9)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ 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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=URRE_LoanAgreementMember
Namespace Prefix:
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Balance Type:
Period Type:

Debt (Details Narrative) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		0 Months Ended	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jan. 05, 2015	Dec. 31, 2014	Apr. 29, 2014	Nov. 13, 2013
Line of Credit Facility [Line Items]
Interest expense	$ 675us-gaap_InterestExpense	$ 414us-gaap_InterestExpense
Common stock, shares outstanding	29,641,527us-gaap_CommonStockSharesOutstanding			25,192,669us-gaap_CommonStockSharesOutstanding
Loan Agreement [Member] \| Resource Capital Fund V LP [Member]
Line of Credit Facility [Line Items]
Debt maturity date	Dec. 31, 2016
Interest expense	201
Debt conversation price per shares	$ 2.60
Resource Capital Fund V LP [Member] \| Loan Agreement [Member]
Line of Credit Facility [Line Items]
Debt maturity date	Dec. 31, 2016
Debt interest rate	10.00%
Issuance of common stock for settlement of interest expenses, shares	102,912		102,912
Issuance of common stock for settlement of interest expenses				199
Resource Capital Fund V LP [Member] \| Loan Agreement [Member] \| May 12, 2015 [Member]
Line of Credit Facility [Line Items]
Common stock, shares outstanding	7,059,243
Percentage of outstanding common stock	23.70%
Resource Capital Fund V LP [Member] \| Loan Agreement [Member] \| May 31, 2015 [Member]
Line of Credit Facility [Line Items]
Debt conversation amount	8,000
Issuance of common stock, shares	3,076,923
Resource Capital Fund V LP [Member] \| Maximum [Member] \| Loan Agreement [Member] \| May 31, 2015 [Member]
Line of Credit Facility [Line Items]
Percentage of outstanding common stock	30.90%
Resource Capital Fund V LP [Member] \| Secured Convertible Loan Facility [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity						15,000
Resource Capital Fund V LP [Member] \| Secured Convertible Loan Facility [Member] \| Maximum [Member] \| Loan Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit fee available					15,000
Resource Capital Fund V LP [Member] \| Secured Convertible Loan Facility [Member] \| Minimum [Member] \| Loan Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit fee available					$ 8,000