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SHORT-TERM BANK BORROWINGS (Details)
1 Months Ended 12 Months Ended
Jul. 23, 2021
CNY (¥)
Jun. 12, 2019
CNY (¥)
May 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Sep. 30, 2021
CNY (¥)
Jun. 30, 2020
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
CNY (¥)
Jun. 30, 2021
CNY (¥)
SHORT-TERM BANK BORROWINGS                          
Short-term bank borrowings       ¥ 180,000,000     ¥ 160,000,000   ¥ 180,000,000        
Restricted cash       223,971,197     186,340,321   223,971,197   $ 27,016,807    
Drawdowns repaid             360,000,000 $ 52,195,094 340,000,000 ¥ 217,394,132      
China Merchants Bank                          
SHORT-TERM BANK BORROWINGS                          
Short-term bank borrowings ¥ 20,000,000   ¥ 20,000,000 20,000,000     0   20,000,000        
Debt term 10 months   12 months                    
Interest rate (in percent) 3.50%   3.30%                    
SPD Silicon Valley Bank loan                          
SHORT-TERM BANK BORROWINGS                          
Short-term bank borrowings       160,000,000     160,000,000   160,000,000        
Collateral deposits       176,000,000   ¥ 176,000,000     176,000,000        
Restricted cash       176,141,464     176,204,380   176,141,464        
Restricted cash released   ¥ 132,000,000                      
SPD Silicon Valley Bank loan | Jiangsu Xiaoniu                          
SHORT-TERM BANK BORROWINGS                          
Short-term bank borrowings           80,000,000              
Face amount       ¥ 160,000,000     ¥ 160,000,000   ¥ 160,000,000     ¥ 160,000,000  
Maximum credit facility amount           160,000,000             ¥ 120,000,000
Interest rate (in percent)       3.20%         3.20%     3.00% 3.50%
Drawdowns repaid         ¥ 40,000,000 60,000,000              
SPD Silicon Valley Bank loan | Changzhou Niudian                          
SHORT-TERM BANK BORROWINGS                          
Short-term bank borrowings   ¥ 120,000,000       80,000,000              
Debt term   12 months                      
Maximum credit facility amount                         ¥ 40,000,000
Drawdowns repaid       ¥ 120,000,000   ¥ 60,000,000