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Selling Expenses (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Selling and Marketing Expense [Abstract]      
Salaries and social welfare $ 761,774 $ 1,765,019 $ 805,048
Travelling expenses 34,244 170,931 150,648
Service fee 12,369 41,437 84,445
Advertising & promotion 19,811 56,259 76,592
Entertainment fee 4,848 42,656 35,438
Office expense 1,960 7,302
Others 2,224 4,567 10,905
Total Selling expenses $ 835,270 $ 2,082,829 $ 1,170,378