XML 58 R39.htm IDEA: XBRL DOCUMENT v3.21.1
Selling Expenses (Tables)
 12 Months Ended
Dec. 31, 2020
Selling Expenses [Abstract]  
Schedule of selling expenses
   Year ended December 31, 
   2020   2019   2018 
Salaries and social welfare  $58,915   $761,774   $1,765,019 
Travelling expenses   1,256    34,244    170,931 
Service fee   -    12,369    41,437 
Advertising & promotion   27,908    19,811    56,259 
Entertainment fee   3,377    4,848    42,656 
Office expense   -    -    1,960 
Others   364    2,224    4,567 
Total Selling expenses  $91,820   $835,270   $2,082,829