Concentrations and Credit Risk (Details 1) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Accounts receivable	$ 15,120,696	$ 21,751,032
Customer A [Member]
Accounts receivable	$ 2,791,799	$ 1,769,416
Concentration risk, percentage of accounts receivable	18.47%	11.49%
Customer B [Member]
Accounts receivable	$ 4,290,917	$ 4,283,023
Concentration risk, percentage of accounts receivable	28.38%	27.82%
Customer C [Member]
Accounts receivable	$ 2,362,341	$ 2,293,257
Concentration risk, percentage of accounts receivable	15.63%	14.89%