Annual report pursuant to Section 13 and 15(d)

Related Parties Transactions (Details)

v3.21.2
Related Parties Transactions (Details)
1 Months Ended 12 Months Ended
Jul. 31, 2012
USD ($)
Jul. 31, 2012
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Related Party Transaction [Line Items]          
Interest earned     $ 2,900,000 $ 700,000
Office rent expenses     $ 12,178 $ 12,177 $ 12,694
Hong Long [Member]          
Related Party Transaction [Line Items]          
Due from related party annual interest     4.35%    
Ping Lin [Member]          
Related Party Transaction [Line Items]          
Lessee, operating lease, description Pursuant to the Office Lease, the annual rent is RMB 84,000 (approximately US$12,200) and the renewed Office Lease expires on July 31, 2021. Pursuant to the Office Lease, the annual rent is RMB 84,000 (approximately US$12,200) and the renewed Office Lease expires on July 31, 2021.      
Operating office lease, rent expense $ 12,200 ¥ 84,000