Investments - Schedule of Long-Term Investments (Details)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)
Equity method investments
Equity securities with readily determinable fair values	¥ 28,355,681	$ 3,884,712	¥ 38,324,789
Equity securities without readily determinable fair values	9,826,143	1,346,176	9,826,143
Available-for-sale debt investment	103,709,272	14,208,112	103,703,272
Total	184,024,217	25,211,214	184,758,800
Shanghai Wiselong Enterprise Management Co., Ltd.
Equity method investments
Equity method investments	27,133,053	3,717,213	25,630,564
Other [Member]
Equity method investments
Equity method investments	¥ 15,000,068	$ 2,055,001	¥ 7,274,032

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ Details

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References + Details