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Trade Accounts and Bills Payable (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Trade Accounts and Bills Payable [Abstract]    
Trade accounts payable $ 19,230,832 $ 23,134,269
Bills payable    
Bank acceptance bills (Note 12) 22,824,075 28,911,556
Commercial acceptance bills 449,238
Trade accounts and bills payable $ 42,054,907 $ 52,495,063