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EQUITY (Details Narrative)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Statutory common reserve funds description	The Statutory Common Reserve Fund as of September 30, 2021 for SCHC, SYCI and DCHC is 16%, 14% and 0% of its registered capital respectively.

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- Definition

Statutory common reserve funds, description

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No definition available.

+ Details

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

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- References

No definition available.

+ Details

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