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4. PREPAID LAND LEASE (Details Narrative)	12 Months Ended
	Dec. 31, 2017 USD ($) km²	Dec. 31, 2016 USD ($) km²
Property Management Fees
Amortization of prepaid land lease	$ 982,108	$ 774,250
Area of land | km²	55	54.97
Aggregate carrying value	$ 645,761	$ 620,978

X

- Definition

Custom Element.

+ References

No definition available.

+ Details

Name:	gure_AggregateLandLeaseCarryingValue
Namespace Prefix:	gure_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Custom Element.

+ References

No definition available.

+ Details

Name:	gure_AreaOfLandLease
Namespace Prefix:	gure_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

The expense charged against earnings for the periodic recognition of capitalized leases. This element may apply to energy companies that lease mineral producing properties and to other enterprises that capitalize property, plant, or equipment obtained through capital leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45031-112735

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration