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TRADE ACCOUNTS RECEIVABLE, NET - Summary of Movement of allowance for doubtful accounts (Details) - Third Party.
6 Months Ended 12 Months Ended
Jun. 30, 2021
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Jun. 30, 2020
CNY (¥)
Jun. 30, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance       ¥ 5,849,504  
Charge to (reversal of) credit losses   ¥ (2,647,068) $ (416,113) 3,730,606  
Less: write-off   0 0 (254,853)  
Foreign currency translation adjustments ¥ (9,830) (49,826) (7,833)    
Ending balance   ¥ 6,618,533 $ 1,040,417 ¥ 9,315,427 $ 1,464,363