Taxation (Details 2) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Taxation [Line Items]
Tax loss carry-forward	$ 1,096,956	$ 991,766
Allowance for doubtful receivables	9,153	136,562
Impairment for inventory	382,375	222,289
Difference for sales cut-off	15,526	17,322
Deferred government grants	69,631	46,446
Property, plant and equipment subsidized by government grant	250,563	269,344
Impairment for property, plant and equipment	138,122	58,304
Total gross deferred tax assets	1,962,326	1,742,033
Valuation allowance	(1,096,956)	(991,766)
Total net deferred tax assets	$ 865,370	$ 750,267