Quarterly report pursuant to Section 13 or 15(d)

Property, plant and equipment, net (Details)

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Property, plant and equipment, net (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Cost    
Construction in progress $ 814,911 $ 715,188
Furniture, fixtures and office equipment 4,615,273 4,025,635
Leasehold improvement 6,458,733 5,865,909
Machinery and equipment 30,313,242 27,526,572
Motor vehicles 1,573,570 1,496,628
Buildings 22,419,779 21,797,158
Property, plant and equipment, cost 66,195,508 61,427,090
Less: accumulated depreciation 20,027,952 17,922,099
Property, plant and equipment, net $ 46,167,556 $ 43,504,991