Land use right, net (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Net	$ 2,445,751	$ 2,639,631
Land Use Right [Member]
Finite-Lived Intangible Assets [Line Items]
Less: accumulated amortization	689,827	659,908
Net	2,445,751	2,639,631
Land Use Right, Land Located in Huizhou [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	$ 3,135,578	$ 3,299,539

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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