v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and cash equivalents (Details) - CNY (¥)
Dec. 31, 2025
Dec. 31, 2024
Minimum    
Cash and cash equivalents    
Original maturities of term deposit 3 months  
Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions ¥ 924,549,865 ¥ 629,875,304
Mainland China | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions 867,111,782 608,426,190
Mainland China | USD | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions 216,499,485 311,341,363
Mainland China | RMB | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions 546,200,227 229,710,326
Mainland China | EUR | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions 103,125,928 66,246,844
Mainland China | GBP | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions 1,286,142 1,127,657
United States | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions 497,269 1,583,932
United States | USD | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions 497,269 1,583,932
Hong Kong S.A.R. | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions 41,558,568 9,379,742
Hong Kong S.A.R. | USD | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions 41,517,988 9,328,332
Hong Kong S.A.R. | HKD | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions 34,370 45,736
Hong Kong S.A.R. | EUR | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions 6,210 5,674
Others | Cash and cash equivalents    
Cash and cash equivalents    
Total cash and cash equivalents balances held at financial institutions ¥ 15,382,246 ¥ 10,485,440