XML 46 R65.htm IDEA: XBRL DOCUMENT v3.20.1
Trade Accounts and Bills Receivable, Net (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Trade Accounts and Bills Receivable, net [Abstract]    
Trade accounts receivable $ 12,517,626 $ 19,054,863
Less: Allowance for doubtful accounts (4,650,686) (3,657,173)
Trade accounts receivable, net 7,866,940 15,397,690
Bills receivable 85,480 6,353,342
Trade accounts and bills receivable, net $ 7,952,420 $ 21,751,032