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ACCOUNTS RECEIVABLE
12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
ACCOUNTS RECEIVABLE

3.       ACCOUNTS RECEIVABLE

 

Accounts receivable consists of trade receivables as follows:

 

   December 31, 
   2017   2016 
         
Billed receivables  $5,529,821   $9,050,127 
Less: allowance for doubtful accounts   (150,000)   (535,514)
   $5,379,821   $8,514,613