Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

Summary of significant accounting policies (Details 2)	12 Months Ended
Summary of significant accounting policies (Details 2)	Dec. 31, 2025 USD ($)	Dec. 31, 2025 CNY (¥)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)
Product Information [Line Items]
Total revenues	$ 60,045,146	¥ 422,045,319	¥ 541,487,420	¥ 580,016,414
Central Processing Advertising Algorithm Services [Member]
Product Information [Line Items]
Total revenues	60,045,146	422,045,319	541,487,420	569,906,586
Sales Of Intelligent Chips [Member]
Product Information [Line Items]
Total revenues				¥ 10,109,828