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Condensed Financial Information of the Parent Company (Details 1) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]        
Revenue $ 18,625,807 $ 18,949,508 $ 37,344,305 $ 34,475,126
Cost of revenue 15,791,848 15,009,671 31,502,466 29,634,859
Gross margin 2,833,959 3,939,837 5,841,839 4,840,267
Administrative expenses (3,423,235) (2,870,240) (4,511,849) (3,407,313)
Loss from operating (589,276) 1,069,597 1,329,990 1,432,954
Profit before income tax expenses (206,072) 764,783 295,982 1,323,634
Income tax expenses 27,866 293,302 119,953 173,060
Net profit for the year (233,938) 471,481 176,029 1,150,574
Total comprehensive income for the year $ 5,688 $ 360,622 181,374 $ 1,361,643
Parent [member]        
Statement Line Items [Line Items]        
Revenue      
Cost of revenue      
Gross margin      
Administrative expenses     (177,009)  
Loss from operating     (177,009)  
Other income     147  
Equity income of subsidiaries     349,783  
Profit before income tax expenses     172,921  
Income tax expenses      
Net profit for the year     172,921  
Total comprehensive income for the year     $ 172,921