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LONG TERM INVESTMENTS - Available for sale investments - (Details)
1 Months Ended 12 Months Ended
Feb. 28, 2019
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
CNY (¥)
Jul. 31, 2017
USD ($)
Jul. 31, 2017
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Securities, Available-for-sale                
Long-term available-for-sale investments           $ 3,924,051 $ 3,980,806  
Unrealized gain on available-for-sale securities           41,149   $ 262,857
Impairment loss on available-for-sale investments           150,978 0 0
Beijing Yingxin Network Technology Co., LTD ("Yingxin")                
Debt Securities, Available-for-sale                
Long-term available-for-sale investments           803,938 753,496  
Percentage of equity interest acquired   2.91% 2.91%          
Purchase consideration   $ 461,092 ¥ 3,000,000          
Unrealized gain on available-for-sale securities           0 0 326,623
Beijing Smart Zhenzhi Technology Co., LTD ("Zhenzhi")                
Debt Securities, Available-for-sale                
Long-term available-for-sale investments           0 167,197  
Percentage of equity interest acquired       3.33% 3.33%      
Purchase consideration       $ 153,697 ¥ 1,000,000      
Unrealized gain on available-for-sale securities             0 $ 23,853
Impairment loss on available-for-sale investments           150,978    
Alphalion Technology Holding Limited ("Alphalion")                
Debt Securities, Available-for-sale                
Long-term available-for-sale investments $ 3,060,113         3,120,113 $ 3,060,113  
Percentage of equity interest acquired 25.00%              
Fair value change recorded           $ 60,000