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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
 
 
 
 
 
 
Additions
 
 
 
 
 
 
 
 
 
Description
 
Balance at
Beginning
of Period
 
 
Charged to
Costs and
Expenses
 
 
Charged to
Other
Accounts
 
 
Deductions
 
 
Balance at
End of
Period
 
Year Ended December 31, 2013
                                        
Allowance for doubtful accounts
   $ 1,597     $ 83     $ -     $ (161 )   $ 1,519  
Tax valuation reserve
   $ 1,200     $ 98     $ -     $ -     $ 1,298  
                                         
Year Ended December 31, 2014
                                        
Allowance for doubtful accounts
   $ 1,519     $ 467     $ -     $ (638 )   $ 1,348  
Tax valuation reserve
   $ 1,298     $ 83     $ -     $ -     $ 1,381  
                                         
Year Ended December 31, 2015
                                        
Allowance for doubtful accounts
   $ 1,348     $ 506     $ -     $ (555 )   $ 1,299  
Tax valuation reserve
   $ 1,381     $ -     $ -     $ (351 )   $ 1,030