COMMITMENTS - Operating lease commitments (Details)	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)
Operating lease commitments
Within 1 year	¥ 143,438	$ 20,503	¥ 143,438
1 - 2 years	143,438	20,503	71,719
Total	¥ 286,876	$ 41,006	¥ 215,157

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach), including the agreed upon property management fee.

No definition available.

Name:	jdzg_LesseeOperatingLeaseLiabilityToBePaidYearTwoIncludingPropertyManagementFee
Namespace Prefix:	jdzg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant