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12. STOCK-BASED COMPENSATION (Details Narrative)	6 Months Ended
	Jun. 30, 2018 USD ($) shares
Stock-based Compensation
Common stock available for issuance | shares	6,739,989
Aggregate intrinsic value of options outstanding and exercisable | $	$ 0

X

- Definition

Custom Element.

+ References

No definition available.

+ Details

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Namespace Prefix:	gure_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	gure_StockbasedCompensationAbstract
Namespace Prefix:	gure_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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