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9. CAPITAL LEASE OBLIGATIONS (Details Narrative) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Capital Lease Obligations Details Narrative |  |
Interest expense from capital lease obligations | $ 202,656 us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease | $ 207,393 us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease

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- Details
Name: | gure_CapitalLeaseObligationsDetailsNarrativeAbstract
Namespace Prefix: | gure_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount, during the lease term, of each minimum [capital] lease payment allocated to interest expense so as to produce a constant periodic rate of interest on the remaining balance of the capital lease obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 35 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6916424&loc=d3e43161-112731 + Details
Name: | us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration