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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]
Description
 
Balance at
Beginning
of Year
 
 
Charged to
Costs and
Expenses
 
 
Charged to
Other
Accounts
 
 
Deductions
 
 
Balance at
End of Year
 
                                         
Year ended December 31, 2015:
                                        
Allowance for doubtful accounts and returns
   $ 181       (28 )      -       12     $ 141  
                                         
Year ended December 31, 2014:
                                        
Allowance for doubtful accounts and returns
   $ 316       (85 )      -       50     $ 181  
                                         
Year ended December 31, 2013:
                                        
Allowance for doubtful accounts and returns
   $ 304       156       -       144     $ 316