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2. Accounts receivable (Tables)
3 Months Ended
Mar. 31, 2016
Receivables [Abstract]  
Accounts receivable
    March 31, 2016   December 31, 2015
                 
Customer receivables   $ 20,628     $ 21,431  
Less:  Allowance for uncollectible accounts     (12,880 )     (12,880 )
    $ 7,748     $ 8,551