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ACCOUNTS PAYABLE, OTHER PAYABLE AND ACCRUED EXPENSES (Details Narrative) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Deposit on subscription of subsidiary's share	$ 154,800	$ 153,260

X

- Definition

Obligations incurred through that date for deposits on subscription of subsidiary's share of expenses. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

No definition available.

+ Details

Name:	gure_DepositOnSubscriptionOfSubsidiarysShare
Namespace Prefix:	gure_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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