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13. STOCK-BASED COMPENSATION (Details Narrative) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Payment Arrangement [Abstract]
Common stock available for issuance	984,698
Aggregate intrinsic value of options outstanding and exercisable	$ 0	$ 526,924
Aggregate intrinsic value of options exercised	$ 0	$ 114,415

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- 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

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ 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
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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=120381028&loc=d3e5070-113901

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