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Nature of Business and Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment Useful Life (Details) | 12 Months Ended
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Dec. 31, 2021
Buildings (including salt pans) | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Useful life (in years) | 8 years
Buildings (including salt pans) | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Useful life (in years) | 20 years
Plant and Machinery (including protective shells, transmission channels and ducts) | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Useful life (in years) | 3 years
Plant and Machinery (including protective shells, transmission channels and ducts) | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Useful life (in years) | 8 years
Motor Vehicles |
Property, Plant and Equipment [Line Items] |
Useful life (in years) | 5 years
Furniture, Fixtures and Equipment | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Useful life (in years) | 3 years
Furniture, Fixtures and Equipment | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Useful life (in years) | 8 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=gure_BuildingsIncludingSaltPansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=gure_PlantAndMachineryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=gure_FurnitireFixturesAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |