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Convertible Notes Receivable - Schedule of Convertible Notes Receivable (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Schedule of Convertible Notes Receivable [Abstract] |  |
Beginning balance | $ 2,602,027 |
Convertible note receivable | (2,500,000) | 2,500,000
Reversal of fair value changes of convertible notes | (102,027) | 102,027
Ending balance |  | $ 2,602,027

X
- Definition Represent the amount of convertible note receivable. + References No definition available. + Details
Name: | gdc_ConvertibleNoteReceivable
Namespace Prefix: | gdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of convertible notes receivable. + References No definition available. + Details
Name: | gdc_ConvertibleNotesReceivable
Namespace Prefix: | gdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent the amount of fair value changes of convertible notes. + References No definition available. + Details
Name: | gdc_FairValueChangesOfConvertibleNotes
Namespace Prefix: | gdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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