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Notes Receivable (Details) - Schedule of notes receivable - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Notes Receivable [Abstract] |  |
Bank notes receivable: | $ 26,713,919 | $ 36,075,366
Commercial notes receivable | 2,034,960 | 1,475,755
Total | $ 28,748,879 | $ 37,551,121

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- Definition Amount of Notes Bank notes receivable. + References No definition available. + Details
Name: | gtec_BankNotesReceivable
Namespace Prefix: | gtec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-06(3)) -URI https://asc.fasb.org/extlink&oid=120401414&loc=d3e604059-122996 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
Name: | us-gaap_ReceivablesNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant