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ACCOUNTS RECEIVABLE.
 6 Months Ended
Jun. 30, 2023
Receivables [Abstract]  
ACCOUNTS RECEIVABLE.

4. ACCOUNTS RECEIVABLE.

  

   June 30, 2023   December 31, 2022 
         
Accounts receivable  $7,725,203   $9,739,150 
Allowances for doubtful accounts   (290,153)   (289,293)
Total accounts receivable  $7,435,050   $9,449,857