Annual report pursuant to Section 13 and 15(d)

Property, plant and equipment, net (Details)

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Property, plant and equipment, net (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Cost    
Construction in progress $ 715,188 $ 1,678,961
Furniture, fixtures and office equipment 4,025,635 3,882,594
Leasehold improvement 5,865,909 4,092,668
Machinery and equipment 27,526,572 29,295,041
Motor vehicles 1,496,628 1,643,173
Building 21,797,158 23,046,056
Property, plant and equipment, cost 61,427,090 63,638,493
Less: accumulated depreciation 17,922,099 16,174,307
Property, plant and equipment, net $ 43,504,991 $ 47,464,186