Annual report pursuant to Section 13 and 15(d)

Segment information (Details 2)

v3.7.0.1
Segment information (Details 2) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net sales $ 173,851,113 $ 146,181,011
China Mainland [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net sales 101,459,371 68,201,408
Asia, others [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net sales 43,764,963 43,547,384
Europe [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net sales 17,958,060 26,101,398
North America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net sales 9,371,838 7,450,898
South America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net sales 759,472 499,669
Africa [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net sales 284,692 190,489
Others [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net sales $ 252,717 $ 189,765