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Convertible Notes Receivable - Schedule of Convertible Notes Receivable (Details) - USD ($)	12 Months Ended
	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