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Trade Accounts and Bills Receivable, net (Tables)
6 Months Ended
Jun. 30, 2021
Trade Accounts And Bills Receivable Net [Abstract]  
Schedule of trade accounts and bills receivable
   December 31,   June 30, 
   2020   2021 
Trade accounts receivable  $33,305,997   $26,356,359 
Less: Allowance for doubtful accounts   (5,266,828)   (5,064,795)
    28,039,169    21,291,564 
Bills receivable   1,532,105    894,471 
   $29,571,274   $22,186,035 

 

Schedule of analysis of the allowance for doubtful accounts
   June 30,   June 30, 
   2020   2021 
Balance at beginning of period  $4,650,686   $5,266,828 
Provision for the period   968,627    
-
 
Reversal - recoveries by cash   (540,925)   (258,578)
Charged to consolidated statements of operations and comprehensive (loss) income   427,702    (258,578)
Foreign exchange adjustment   (69,158)   56,545 
Balance at end of period  $5,009,230   $5,064,795