Quarterly report pursuant to Section 13 or 15(d)

D. ACCOUNTS RECEIVABLE (Details)

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D. ACCOUNTS RECEIVABLE (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Components of accounts receivable    
Accounts receivable $ 1,294,017 $ 1,632,459
Allowance for doubtful accounts (9,742) (22,173)
Accounts receivable, net $ 1,284,275 $ 1,610,286