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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: