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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
   
Balance at
Beginning
of Year
   
Bad Debt
Expense
    
Write-offs
Net of
Recoveries
    
Balance
at End
of Year
  
                                 
Allowance for doubtful accounts:
                                
Year Ended December 31, 2014
   $
183
     $
305
     $
282
     $
206
  
Year Ended December 31, 2015
   $
206
     $
111
     $
144
     $
173
  
Year Ended December 31, 2016
   $
173
     $
218
     $
222
     $
169