v3.26.1
Income taxes - Movement of the valuation allowance (Details)
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2025
USD ($)
Income taxes          
Balance at the beginning of the year ¥ (307,902,579) $ (44,029,483) ¥ (226,317,275) ¥ (214,884,582)  
Addition (87,473,889) (12,508,600) (86,384,559) (20,828,173)  
Reductions 207,886,000 29,727,303 4,799,255 9,395,480  
Net change in the valuation allowance 120,412,111 17,218,703 (81,585,304) (11,432,693)  
Balance at the end of the year (187,490,468) (26,810,780) (307,902,579) (226,317,275)  
Gross deferred tax assets associated with deregistration 159,532,567 $ 22,812,854      
Operating loss carry forwards from subsidiaries 15,557,819   178,363,447   $ 2,224,739
Tax benefit on operating loss carry forwards 0   0 883,214  
Tax benefits utilized amount 1,821,356   233,258 4,876,301 260,450
Advertising and market related expenses carryforwards ¥ 0   0 ¥ 8,239,531  
Withholding tax rate on dividends (as a percent) 10.00% 10.00%      
Withholding tax rate on dividends if investors qualifies as beneficial owner with holdings above the threshold percentage (as a percent) 5.00% 5.00%      
Threshold beneficial owner percentage determining withholding income tax rate (as a percent) 25.00% 25.00%      
Deferred tax liabilities, earnings ¥ 45,622,417   58,600,000   6,523,919
Withholding tax on distributed earnings 58,477,583 $ 8,362,183 15,650,000    
Unrecognized deferred tax liabilities ¥ 493,048,319   425,568,636   $ 70,504,972
Unrecognized deferred tax liabilities, tax rate 10.00%       10.00%
Subsidiaries and VIEs and subsidiaries of the VIEs          
Income taxes          
Undistributed earnings on subsidiaries ¥ 4,930,483,185   ¥ 4,255,686,362   $ 705,049,718