Property, plant and equipment, net (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Cost
Construction in progress	$ 6,991,889	$ 1,330,643
Furniture, fixtures and office equipment	7,221,527	5,794,983
Leasehold improvement	7,090,162	7,080,409
Machinery and equipment	40,316,428	33,176,416
Motor vehicles	1,508,398	1,498,605
Building	19,166,951	20,169,197
Property, plant and equipment, cost	82,295,355	69,050,253
Less: accumulated depreciation	25,772,178	22,529,477
Property, plant and equipment, net	$ 56,523,177	$ 46,520,776

Vehicles, Gross

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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