Quarterly report pursuant to Section 13 or 15(d)

Concentrations (Details) - Schedule of customers

v3.21.1
Concentrations (Details) - Schedule of customers - More Than 10% Revenues [Member]
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
A (Hebei Daopei, a related party) [Member]    
Supply Commitment [Line Items]    
Customer 30.00% 30.00%
B [Member]    
Supply Commitment [Line Items]    
Customer 20.00% 18.00%
C [Member]    
Supply Commitment [Line Items]    
Customer 13.00% 15.00%