Annual report pursuant to Section 13 and 15(d)

Segment information (Details 3)

v3.7.0.1
Segment information (Details 3) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]    
Accounts receivable $ 46,280,769 $ 36,139,866
China Mainland [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Accounts receivable 29,663,633 23,832,388
Asia, others [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Accounts receivable 10,441,358 6,443,781
Europe [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Accounts receivable 3,875,979 5,324,389
North America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Accounts receivable 2,260,840 433,458
South America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Accounts receivable 26,610 0
Africa [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Accounts receivable 378 55,240
Others [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Accounts receivable $ 11,971 $ 50,610