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Related Party Transactions (Details) - Schedule of related party funds lending - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Zhejiang Zhonggong Machinery Co., Ltd. [Member] |  |
Withdraw funds from related parties: |  |
Withdraw funds from related parties |  | $ 77,611
Deposit funds with related parties: |  |
Deposit funds with related parties | 394,892 | 139,699
Cenntro Holding Limited [Member] |  |
Withdraw funds from related parties: |  |
Withdraw funds from related parties |  | 251,973
Deposit funds with related parties: |  |
Deposit funds with related parties |  | 250,000
Zhuhai Hengzhong Industrial Investment Fund (Limited Partnership) [Member] |  |
Withdraw funds from related parties: |  |
Withdraw funds from related parties | 207,352 | 35,080
Deposit funds with related parties: |  |
Deposit funds with related parties | 209,383 | 677,697
Peter Zuguang Wang [Member] |  |
Withdraw funds from related parties: |  |
Withdraw funds from related parties |  | 25,000
Deposit funds with related parties: |  |
Deposit funds with related parties |  | 25,000
Cenntro Smart Manufacturing Tech. Co., Ltd. [Member] |  |
Withdraw funds from related parties: |  |
Withdraw funds from related parties | 74,054 | 29,647
Deposit funds with related parties: |  |
Deposit funds with related parties | 74,054 | 36,632
Xinchang County Jiuxin Investment Management Partnership (LP) [Member] |  |
Deposit funds with related parties: |  |
Deposit funds with related parties | 1,481,087 | 2,851,515
Zhejiang Kangchen Biotechnology Co., Ltd. [Member] |  |
Deposit funds with related parties: |  |
Deposit funds with related parties |  | $ 64,505

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- References No definition available. + Details
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Namespace Prefix: | gtec_
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- Definition Withdraw funds from related parties. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=gtec_ZhejiangZhonggongMachineryCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=gtec_CenntroHoldingLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=gtec_ZhuhaiHengzhongIndustrialInvestmentFundLimitedPartnershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=gtec_PeterZuguangWangMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=gtec_CenntroSmartManufacturingTechCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=gtec_XinchangCountyJiuxinInvestmentManagementPartnershipLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=gtec_ZhejiangKangchenBiotechnologyCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |