Quarterly report pursuant to Section 13 or 15(d)

D. ACCOUNTS RECEIVABLE (Details)

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D. ACCOUNTS RECEIVABLE (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Components of accounts receivable    
Accounts receivable $ 2,801,015 $ 2,286,690
Allowance for doubtful accounts (28,517) (23,343)
Accounts receivable, net $ 2,772,498 $ 2,263,347