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Trade Accounts and Bills Receivable, Net (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Trade Accounts and Bills Receivable, net [Abstract]    
Trade accounts receivable $ 20,315,956 $ 19,054,863
Less: Allowance for doubtful accounts (3,749,172) (3,700,922)
Trade accounts receivable, net 16,496,232 15,397,690
Bills receivable 320,653 6,353,342
Trade accounts and bills receivable, net $ 16,816,885 $ 21,751,032