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Land Use Rights (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Land Use Rights Abstract |  |
Land use rights, net | $ 3,640 | $ 4,040

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

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