Represents the percentage of commission to be paid by the entity on gross proceeds from the sale of shares.

No definition available.

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

- Definition

Equity Issuance Per Share Amount 1.

+ References

No definition available.

+ Details

Name:	URRE_EquityIssuancePerShareAmount1
Namespace Prefix:	URRE_
Data Type:	num:perShareItemType
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

Warrant Exercisable Period.

+ References

No definition available.

+ Details

Name:	URRE_WarrantExercisablePeriod
Namespace Prefix:	URRE_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Warrant Exercisable Period One.

+ References

No definition available.

+ Details

Name:	URRE_WarrantExercisablePeriodOne
Namespace Prefix:	URRE_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(4))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Cash received for fees during the current period. This element excludes cash proceeds from license fees.

+ 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 (c)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585

+ Details

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

- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

+ Details

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

- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

+ Details

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

- Definition

The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

+ 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=56944662&loc=d3e3179-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562

+ Details

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

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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

- Details

Name:	us-gaap_CounterpartyNameAxis=URRE_BTIGLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

Common Stock (Details Narrative) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended		3 Months Ended		0 Months Ended
	Mar. 06, 2015	Jan. 05, 2015	Mar. 31, 2015	Dec. 31, 2014	Jul. 02, 2014	Oct. 31, 2011
Securities Purchase Agreement [Member]
Proceeds from direct offering	$ 6,000
Proceeds from agent's fees and offering expenses	5,389
Sale of common stock, units	4,000,000
Sale of common stock price per unit	$ 1.50
Issuance of warrant to purchases of common stock each unit consist of one shares	$ 0.55
Common stock exercise price per whole shares	$ 2.00
Warrant exercisable period at beginning	5 years
Warrant exercisable period at ending	5 years
Loan Agreement [Member] \| Resource Capital Fund V LP [Member]
Issuance of common stock for settlement of interest expenses, shares		102,912	102,912
Issuance of common stock for settlement of interest expenses				199
BTIG, LLC [Member] \| ATM Sales Agreement [Member]
Proceeds from direct offering					4,100	15,000
Sale of common stock, units			160,500
Percentage of commission to be paid on gross proceeds						3.00%
Proceeds from sales of common stock			276
BTIG, LLC [Member] \| ATM Sales Agreement [Member] \| May 12, 2015 [Member]
Proceeds from sales of common stock			6,000
Proceeds from future sale of equity			15,000