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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
Column A
  
Column B
    
Column C
    
Column D
    
Column E
  
           
Charged
                  
   
Balance at
    
(Credited)
 
    
 
 
  
Balance at
  
   
Beginning
    
to Costs &
 
    
 
 
  
End
  
Descriptions
  
of Period
    
Expenses
 
  
Deductions
 
  
of Period
  
2018
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Doubtful receivables
 
$
96
    
$
-
 
  
$
96
(c)
  
$
-
  
Discounts, returns,
and allowances
   
107
      
-
 
    
107
(c)
    
-
  
   
$
203
    
$
-
 
  
$
203
 
  
$
-
  
                                 
2017
                                
Doubtful receivables   $
117
     $
71
 
   $
92
(a)
   $
96
  
Discounts, returns, and allowances
    
155
    
(48
)(b)
    
-
 
    
107
  
    $
272
     $
23
 
   $
92
 
   $
203