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Trade Accounts and Bills Receivable, net (Tables)
9 Months Ended
Sep. 30, 2021
Trade Accounts And Bills Receivable Net [Abstract]  
Schedule of trade accounts and bills receivable
   December 31,   September 30, 
   2020   2021 
Trade accounts receivable  $33,305,997   $26,874,297 
Less: Allowance for doubtful accounts   (5,266,828)   (4,894,614)
    28,039,169    21,979,683 
Bills receivable   1,532,105    251,759 
   $29,571,274   $22,231,442 

 

Schedule of analysis of the allowance for doubtful accounts
   September 30,   September 30, 
   2020   2021 
Balance at beginning of period  $4,650,686   $5,266,828 
Provision for the period   981,241    
-
 
Reversal - recoveries by cash   (917,707)   (437,475)
Charged to consolidated statements of operations and comprehensive (loss) income   63,534    (437,475)
Foreign exchange adjustment   120,420    65,261 
Balance at end of period  $4,834,640   $4,894,614