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v3.24.1

Summary of significant accounting policies (Details Narrative) | 12 Months Ended |
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Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥)
Accounting Policies [Abstract] |  |  |  |  |
Cash and cash equivalents |  | ¥ 151,119,985 | ¥ 48,006,979 | $ 17,795,126 | ¥ 126,037,538
Working capital |  | ¥ 158,339,349 |  |  | 134,894,390
Foreign cuurency transactions | 7.0467 | RMB 6.7290 | USD 1.00 to RMB 6.3721 |  |
Doubtful accounts for accounts receivable |  | ¥ 4,862,941 |  |  | 4,588,786
Inventory Valuation Reserves |  | 176,459 |  |  | ¥ 176,459
Allowance for noncurrent prepayments and deposits |  | 3,300 |  |  |
Advertising expense | ¥ 2,727,591 | 3,735,551 | ¥ 148,521 |  |
Government subsidies | 844,332 | 478,809 | 76,988 |  |
Total expenses | ¥ 1,512,164 | ¥ 4,630,467 | ¥ 3,414,706 |  |

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