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Concentration of risk (Details Narrative) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 | Dec. 31, 2023 CNY (¥)
Concentration Risk [Line Items] |  |  |  |
Insurance coverage | $ 72,000 |  |  | ¥ 500,000
Cash deposits | $ 17,795,126 | ¥ 151,119,985 |  | ¥ 126,037,538
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 12.90% | 18.70% |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customers [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 25.00% |  |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 12.20% |  |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 19.80% | 26.40% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Second Customer [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 13.00% | 15.80% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Third Customer [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 11.80% |  |  |
Purchases [Member] | Vendor Concentration Risk [Member] | Two Vendors [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  |  | 35.10% |
Purchases [Member] | Vendor Concentration Risk [Member] | One Vendor [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 13.80% |  |
Purchases [Member] | Vendor Concentration Risk [Member] | First Vendor [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 37.60% |  |  |
Purchases [Member] | Vendor Concentration Risk [Member] | Second Vendor [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 13.00% |  |  |
Purchases [Member] | Vendor Concentration Risk [Member] | Third Vendor [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 12.00% |  |  |
Accounts Payable [Member] | Vendor Concentration Risk [Member] | First Vendor [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 36.10% | 63.60% |  |
Accounts Payable [Member] | Vendor Concentration Risk [Member] | Second Vendor [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 26.10% | 10.00% |  |
Accounts Payable [Member] | Vendor Concentration Risk [Member] | Third Vendor [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 22.20% |  |  |

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