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Schedule II - Valuations and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Summary of Valuation and Qualifying Accounts [Table Text Block]
 
 
Balance at Beginning of Period
 
 
Charged to Profit and Loss
 
 
Deduction from Reserves
 
 
Balance at End of Period
 
Year ended December 31, 2016:
                                
Allowance for doubtful accounts
   $
751
    $
295
    $
(531
 )   $
515
 
Valuation allowance for deferred tax assets
    
7,057
     
1,160
     
-
     
8,217
 
                                 
Year ended December 31, 2015:
                                
Allowance for doubtful accounts
   $
755
    $
416
    $
(420
 )   $
751
 
Valuation allowance for deferred tax assets
    
1,858
     
5,217
     
(18
 )    
7,057
 
                                 
Year ended December 31, 2014:
                                
Allowance for doubtful accounts
   $
685
    $
411
     $
(341
 )   $
755
 
Valuation allowance for deferred tax assets
    
1,894
     
26
     
(62
 )    
1,858