Annual report pursuant to Section 13 and 15(d)

Subsequent Event (Details)

v3.8.0.1
Subsequent Event (Details) - USD ($)
12 Months Ended
Mar. 08, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 24, 2018
Subsequent Event (Textual)          
Repayments of short-term bank loans   $ 21,673,260 $ 22,234,749 $ 30,989,630  
Subsequent Event [Member]          
Subsequent Event (Textual)          
Repayments of short-term bank loans $ 5,000,000        
Subsequent Event [Member] | Board of Directors [Member]          
Subsequent Event (Textual)          
Cash dividend per share         $ 0.01