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LOAN RECEIVABLES - Additional information (Details)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Nov. 30, 2020
USD ($)
Nov. 30, 2020
CNY (¥)
Short-term financing, balance amount $ 2,172,766   $ 2,609,748      
Friend Sourcing Ltd [Member]            
Interest rate of debt 8.00% 8.00%        
Tianjin Takung [Member]            
Short term financing net amount         $ 1,008,784 ¥ 6,500,000
Interest rate of debt 6.00% 6.00%        
Short-term financing, balance amount     543,191 ¥ 3,500,000    
Short-term financing, principal amount $ 470,032 ¥ 3,028,603 $ 465,593 ¥ 3,000,000    
Interest receivable $ 4,439 ¥ 28,603