Quarterly report pursuant to Section 13 or 15(d)

Concentrations (Details)

v3.20.2
Concentrations (Details) - More than 10% Revenues [Member]
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
A (Beijing Daopei, a related party) [Member]        
Customer [1] 14.00% [1] [1]
B (Hebei Daopei, a related party) [Member]        
Customer [1] 14.00% [1] [1]
C [Member]        
Customer 28.00% 20.00% 29.00% 24.00%
D [Member]        
Customer 17.00% 14.00% 17.00% 16.00%
E [Member]        
Customer 14.00% [1] 14.00% [1]
[1] Less than 10%