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3. ACCOUNTS RECEIVABLE
 6 Months Ended
Jun. 30, 2017
Notes to Financial Statements  
3. ACCOUNTS RECEIVABLE
   

June 30,

2017

    

December 31,

2016

  
Accounts receivable   $ 3,863,923     $ 3,044,652  
Allowances for doubtful accounts     (38,991 )     (36,499 )
    $ 3,824,932     $ 3,008,153