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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%

X

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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