XML 57 R45.htm IDEA: XBRL DOCUMENT v3.21.1
Restricted Cash (Details)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Sep. 25, 2017
USD ($)
Supplemental Cash Flow Elements [Abstract]        
Bank deposits used to pledge the bank acceptance notes $ 695,548      
Notes payable 0 $ 908,008    
Restricted cash   43,000 ¥ 300,000  
Non-interest bearing escrow account [1] $ 500,000 [1]   $ 500,000
[1] In connection with its initial public offering, the Company agreed to deposit $500,000 in a non-interest bearing escrow account to satisfy the potential indemnification obligation for two years following September 25, 2017. The Company received the deposit in full during the year ended December 31, 2020.