Quarterly report pursuant to Section 13 or 15(d)

D. ACCOUNTS RECEIVABLE (Details)

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D. ACCOUNTS RECEIVABLE (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Components of accounts receivable    
Accounts receivable $ 2,435,702 $ 3,096,914
Allowance for doubtful accounts (34,609) (70,807)
Accounts receivable, net $ 2,401,093 $ 3,026,107