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12. STOCK-BASED COMPENSATION (Details Narrative)	3 Months Ended
	Mar. 31, 2018 USD ($) shares
Share-based Compensation [Abstract]
Common stock available for issuance | shares	6,714,989
Aggregate intrinsic value of options outstanding and exercisable | $	$ 0

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- Definition

Custom Element.

+ References

No definition available.

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

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- References

No definition available.

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Data Type:	xbrli:stringItemType
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- 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

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