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2. BUSINESS ACQUISITION (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Feb. 04, 2015
Goodwill $ 31,452,271us-gaap_Goodwill $ 0us-gaap_Goodwill  
SCRC      
Cash     14,074,720us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ dei_LegalEntityAxis
= gure_SCRCMember
Accounts receivable     19,365,259us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ dei_LegalEntityAxis
= gure_SCRCMember
Inventories     1,646,196us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ dei_LegalEntityAxis
= gure_SCRCMember
Other current assets     82,562us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ dei_LegalEntityAxis
= gure_SCRCMember
Property, plant and equipment, net     17,891,360us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= gure_SCRCMember
Prepaid land leases, net of current portion     4,800,404us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ dei_LegalEntityAxis
= gure_SCRCMember
Goodwill     31,452,271us-gaap_Goodwill
/ dei_LegalEntityAxis
= gure_SCRCMember
Accounts payable and accrued expenses     (8,670,568)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ dei_LegalEntityAxis
= gure_SCRCMember
Taxes payable     (963,458)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ dei_LegalEntityAxis
= gure_SCRCMember
Total purchase price     $ 79,678,746us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ dei_LegalEntityAxis
= gure_SCRCMember