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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2013
   $ 244     $ 145     $ 206     $ 183  
Year Ended December 31, 2014
   $ 183     $ 305     $ 282     $ 206  
Year Ended December 31, 2015
   $ 206     $ 111     $ 144     $ 173