Annual report pursuant to Section 13 and 15(d)

D. ACCOUNTS RECEIVABLE (Details)

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D. ACCOUNTS RECEIVABLE (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Components of accounts receivable    
Accounts receivable $ 2,286,690 $ 1,497,295
Allowance for doubtful accounts (23,343) (36,873)
Accounts receivable, net $ 2,263,347 $ 1,460,422