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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed statements of cash flows (Details)
12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Condensed Statements of Cash Flows        
Net cash provided by (used in) operating activities ¥ 93,735,092 $ 13,202,312 ¥ (121,856,343) ¥ 334,174,702
Net cash provided by (used in) investing activities 216,310,708 30,466,726 397,891,899 (295,058,974)
Net cash provided by financing activities (59,345,977) (8,358,706) (17,796,914) 6,246,384
Effect of foreign currency exchange rate changes on cash, cash equivalents and restricted cash 8,913,200 1,255,398 30,043,572 (8,490,370)
Net increase in cash, cash equivalents and restricted cash 259,613,023 36,565,730 288,282,214 36,871,742
Cash, cash equivalents and restricted cash at the beginning of the year 720,627,170 101,498,214 432,344,956 395,473,214
Cash, cash equivalents and restricted cash at the end of the year 980,240,193 $ 138,063,944 720,627,170 432,344,956
Reportable Legal Entities | Parent Company        
Condensed Statements of Cash Flows        
Net cash provided by (used in) operating activities 14,392,402   (23,565,305) 25,839,822
Net cash provided by (used in) investing activities 133,818,900   (95,940,040) 16,132,750
Net cash provided by financing activities 654,023   2,203,086 6,246,384
Effect of foreign currency exchange rate changes on cash, cash equivalents and restricted cash 4,034,789   21,972,182 (6,107,381)
Net increase in cash, cash equivalents and restricted cash 152,900,114   (95,330,077) 42,111,575
Cash, cash equivalents and restricted cash at the beginning of the year 188,580,274   283,910,351 241,798,776
Cash, cash equivalents and restricted cash at the end of the year ¥ 341,480,388   ¥ 188,580,274 ¥ 283,910,351