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v3.23.1

Notes Payable (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Notes Payable (Details) [Line Items] |  |
Restricted cash | $ 3,430 | $ 6,740
Notes receivable | 15,510 | 28,140
Land use rights | $ 3,640 | $ 4,040
Percentage of bank charges | 0.05% |
Minimum [Member] |  |
Notes Payable (Details) [Line Items] |  |
Interest-free notes payable, term | 6 months |
Maximum [Member] |  |
Notes Payable (Details) [Line Items] |  |
Interest-free notes payable, term | 1 year |

X
- Definition Land use rights. + References No definition available. + Details
Name: | gtec_LandUseRight
Namespace Prefix: | gtec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | gtec_NoteReceivableDateOfIssuance
Namespace Prefix: | gtec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- References No definition available. + Details
Name: | gtec_PercentageOfBankCharges
Namespace Prefix: | gtec_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | gtec_RestrictedCashAndCashEquivalentsValue
Namespace Prefix: | gtec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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