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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

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- Definition Custom Element. + References No definition available. + Details
Name: | gure_AggregateLandLeaseCarryingValue
Namespace Prefix: | gure_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Custom Element. + References No definition available. + Details
Name: | gure_AreaOfLandLease
Namespace Prefix: | gure_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | gure_NotesToFinancialStatementsAbstract
Namespace Prefix: | gure_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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