Annual report pursuant to Section 13 and 15(d)

Concentrations (Details)

v3.20.1
Concentrations (Details) - More than 10% Revenues [Member]
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
A (Beijing Daopei, a related party) [Member]    
Customer [1] 17.00%
B (Hebei Daopei, a related party) [Member    
Customer 19.00% [1]
C [Member]    
Customer 26.00% 21.00%
D [Member]    
Customer 14.00% 14.00%
E [Member]    
Customer 11.00% 11.00%
[1] Less than 10%