Annual report pursuant to Section 13 and 15(d)

D. ACCOUNTS RECEIVABLE (Tables)

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D. ACCOUNTS RECEIVABLE (Tables)
12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Schedule of accounts receivable

Components of accounts receivable as of December 31, 2020 and 2019 are as follows:

 

    2020     2019  
Accounts receivable   $ 873,147     $ 2,338,626  
Allowance for doubtful accounts     (7,973 )     (55,039 )
Accounts receivable, net   $ 865,174     $ 2,283,587