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3. Receivables (Tables)
12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Receivables
    December 31,
    2015   2014
Customer receivables   $ 21,431     $ 41,234  
Less:  Allowance for uncollectible accounts     (12,880 )     (13,897 )
    $ 8,551     $ 27,337