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13. STOCK-BASED COMPENSATION (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Share-based Compensation [Abstract]
Outstanding	1,964,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2,744,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Range of Exercise Prices, Lower Limit	$ 0.95gure_ShareBasedCompensationOptionsOutstandingExercisePriceRangeLowerRangeLimit
Range of Exercise Prices, Upper Limit	$ 12.60gure_ShareBasedCompensationOptionsOutstandingExercisePriceRangeUpperRangeLimit
Weighted Average Remaining Contractual Life (Years)	2 years 4 months 28 days

X

- Definition

Share Based Compensation Options Outstanding Exercise Price Range Lower Range Limit

+ References

No definition available.

+ Details

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Period Type:	instant

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- Definition

Share Based Compensation Options Outstanding Exercise Price Range Upper Range Limit

+ References

No definition available.

+ Details

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Namespace Prefix:	gure_
Data Type:	num:perShareItemType
Balance Type:	na
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- Details

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

X

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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