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Trade Accounts and Bills Receivable, Net (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Trade accounts and bills receivable, net $ 16,654,801 $ 21,751,032
Trade Accounts Receivable [Member]    
Trade accounts receivable 20,596,681 19,054,863
Less: Allowance for doubtful accounts (3,943,983) (3,657,173)
Trade accounts receivable, net 16,652,698 15,397,690
Bills receivable 2,103 6,353,342
Trade accounts and bills receivable, net $ 16,654,801 $ 21,751,032