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BORROWINGS - Short term borrowings (Details)
1 Months Ended
Dec. 31, 2022
CNY (¥)
Jul. 31, 2022
CNY (¥)
Apr. 30, 2022
CNY (¥)
Mar. 31, 2022
CNY (¥)
Aug. 31, 2021
CNY (¥)
Jun. 30, 2021
CNY (¥)
Nov. 30, 2020
CNY (¥)
Sep. 30, 2020
CNY (¥)
Jun. 30, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
Jul. 31, 2022
USD ($)
Apr. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Aug. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Nov. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Borrowings from Bank of Jiangsu Co., Ltd                                    
Short-term debt                                    
Amount borrowed   ¥ 20,000,000                 $ 2,871,665              
Term of the debt   1 year                                
Interest rate (as a percent)   3.70%                 3.70%              
Borrowings from Bank of Ningbo Co., Ltd                                    
Short-term debt                                    
Amount borrowed               ¥ 5,000,000                 $ 766,295  
Term of the debt               1 year                    
Interest rate (as a percent)               4.20%                 4.20%  
Borrowings from Agricultural Bank of China Limited                                    
Short-term debt                                    
Amount borrowed         ¥ 10,000,000 ¥ 9,900,000     ¥ 10,000,000         $ 1,568,455 $ 1,552,771     $ 1,532,591
Term of the debt         1 year 1 year     1 year                  
Interest rate (as a percent)         4.05% 4.05%     4.20%         4.05% 4.05%     4.20%
China Merchants Bank Co., Ltd                                    
Short-term debt                                    
Amount borrowed     ¥ 20,100,000 ¥ 9,900,000     ¥ 5,000,000         $ 2,886,024 $ 1,421,474     $ 770,962    
Term of the debt     1 year 1 year     1 year                      
Interest rate (as a percent)     3.70% 3.90%     4.10%         3.70% 3.90%     4.10%    
China Merchants Bank Co., Ltd., two                                    
Short-term debt                                    
Amount borrowed             ¥ 5,000,000                 $ 770,962    
Term of the debt             1 year                      
Interest rate (as a percent)             4.10%                 4.10%    
China Construction Bank Corporation                                    
Short-term debt                                    
Amount borrowed ¥ 25,000,000                 $ 3,589,582                
Term of the debt 1 year                                  
Interest rate (as a percent) 3.65%                 3.65%