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2. Accounts receivable (Tables)
3 Months Ended
Mar. 31, 2017
Receivables [Abstract]  
Accounts receivable
    March 31, 2017  

 

December 31, 2016

         
Customer receivables   $ 35,412     $ 14,432  
Less:  Allowance for uncollectible accounts     (14,401 )     (14,401 )
    $ 21,011     $ 31