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v3.23.1

Notes Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Notes Receivable (Details) [Line Items] |  |
Security for issuance | $ 15,510 | $ 28,140
Notes receivable | $ 13,270 | $ 24,890
Notes Receivable [Member] |  |
Notes Receivable (Details) [Line Items] |  |
Notes receivable term | 6 months |

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

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

X
- Definition Security for issuance amount. + References No definition available. + Details
Name: | gtec_SecurityForIssuanceAmount
Namespace Prefix: | gtec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_NotesReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |