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Accounts receivable, net | 12 Months Ended
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Dec. 31, 2024
Credit Loss [Abstract] |
Accounts receivable, net | Note 7 — Accounts receivable, net Accounts receivable, net consisted of the following:
Schedule of accounts receivable, net |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2023 |  |  | December 31, 2024 |  |  | December 31, 2024 |
|  | RMB |  |  | RMB |  |  | USD |
Accounts receivable |  |  | 26,963,149 |  |  |  | 23,714,517 |  |  |  | 3,298,998 |
Less: allowance of credit losses |  |  | (3,951,391 | ) |  |  | - |  |  |  | - |
Accounts receivable, net |  |  | 23,011,758 |  |  |  | 23,714,517 |  |  |  | 3,298,998 |
The following table summarizes the changes in credit losses:
Schedule of changes in allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2023 |  |  | December 31, 2024 |  |  | December 31, 2024 |
|  | RMB |  |  | RMB |  |  | USD |
Beginning balance |  |  | 8,487,562 |  |  |  | 3,951,391 |  |  |  | 549,690 |
Addition |  |  | 3,951,391 |  |  |  | - |  |  |  | - |
Recovery |  |  | - |  |  |  | (3,951,391 | ) |  |  | (549,690 | )
Deconsolidation of Fe-da and subsidiaries |  |  | (8,487,562 | ) |  |  | - |  |  |  | - |
Ending balance |  |  | 3,951,391 |  |  |  | - |  |  |  | - |
Credit losses for the years ended December 31, 2023 and 2024 amounted to RMB 3,951,391 and 0 nil, respectively.

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- Definition The entire disclosure for accounts receivable, contract receivable, receivable held-for-sale, and nontrade receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/310/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/326/tableOfContent + Details
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- References No definition available. + Details
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