Quarterly report pursuant to Section 13 or 15(d)

Property, plant and equipment, net (Details Textual)

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Property, plant and equipment, net (Details Textual) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Depreciation $ 2,361,482 $ 2,415,561  
Property, Plant and Equipment, Transfers and Changes $ 85,571 $ 26,988 $ 229,951