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Lease Liabilities-Finance and Operating Lease - Schedule of Operating Leased Liabilities (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Lease Liabilities-finance And Operating Lease
Total Operating lease liabilities	$ 7,836,144	$ 8,499,692
[custom:ImputedInterestRateOnOperatingLeaseLiabilities-0]		4.89%
Less: Current portion	(470,999)	$ (477,350)
Operating lease liabilities, net of current portion	$ 7,365,145	$ 8,022,342

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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

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- Definition

Imputed interest rate on operating lease liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	gure_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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Balance Type:	credit
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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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