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Unaudited Interim Condensed Consolidated Statements of Cash Flows (Parentheticals)	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Statement of Cash Flows [Abstract]
Issuance of common stock for interest in SH Xianzhui	13.3333%	13.3333%

X

- Definition

Represents amount of common stock interest.

+ References

No definition available.

+ Details

Name:	gdc_IssuanceOfCommonStockForInterest
Namespace Prefix:	gdc_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration