Summary of significant accounting policies (Details Narrative) |
6 Months Ended | ||
|---|---|---|---|
|
Jun. 30, 2026
USD ($)
|
Jun. 30, 2026
CNY (¥)
|
Dec. 31, 2025
CNY (¥)
|
|
| Accounting Policies [Abstract] | |||
| Foreign cuurency transactions | USD 1.00 to RMB 6.8109 and RMB 7.0288 | ||
| Foreign cuurency transactions | USD 1.00 to RMB 6.8956 and RMB 7.1837 | ||
| Doubtful accounts for accounts receivable | $ 467,358 | ¥ 3,183,129 | ¥ 5,513,270 |
| Contract assets | 0 | 0 | |
| Contract liabilities | $ 617,339 | ¥ 4,204,635 | ¥ 5,483,268 |