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FINANCE LEASE RIGHT-OF-USE ASSETS (Details Narrative) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finance Lease Right-of-use Assets
Depreciation and amortization expense	$ 1,434	$ 1,308	$ 2,862	$ 2,635

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- Definition

Depreciation and amortization expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	gure_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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