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Concentration on Revenues and Cost of Goods Sold (Details) - Schedule of concentration of major customers and suppliers - Revenues [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Revenue, Major Customer [Line Items] |  |
Total Revenues | $ 28,417,108 | $ 33,018,705
Customer percentage | 31.28% | 33.41%
Company A [Member] |  |
Revenue, Major Customer [Line Items] |  |
Total Revenues | $ 15,570,726 | $ 18,252,003
Customer percentage | 17.14% | 18.47%
Company B [Member] |  |
Revenue, Major Customer [Line Items] |  |
Total Revenues | $ 12,846,382 | $ 14,766,702
Customer percentage | 14.14% | 14.94%

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

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- Definition Carrying amount of total assets less total liabilities of a designated geographic area if disclosed as a concentration risk. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |