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2. Receivables (Tables)
12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Receivables
    December 31,
    2016   2015
Customer receivables   $ 14,432     $ 21,431  
Less:  Allowance for uncollectible accounts     (14,401 )     (12,880 )
    $ 31     $ 8,551