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Schedule II - Valuation and Qualifying Accounts (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Summary of Valuation and Qualifying Accounts [Table Text Block]
   
Balance at Beginning of Perio
d
   
Charged to
Profit and
Los
s
   
Deduction
from
Reserve
s
   
Balance at
End of
Perio
d
 
Year Ended December 31, 2017
:
                               
Allowance for doubtful account
s
  $
515
 
  $
637
    $
(675
)   $
477
 
Valuation allowance for deferred tax asset
s
   
8,217
 
   
2,196
     
-
     
10,413
 
                                 
Year Ended December 31, 2016
:
                               
Allowance for doubtful account
s
  $
751
(1)
  $
295
    $
(531
)   $
515
 
Valuation allowance for deferred tax asset
s
   
7,057
 
   
1,160
     
-
     
8,217
 
                                 
Year Ended December 31, 2015
:
                               
Allowance for doubtful account
s
  $
755
(1)
  $
416
    $
(420
)   $
751
(1)
Valuation allowance for deferred tax asset
s
   
1,858
 
   
5,217
     
(18
)    
7,057