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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Valuation Allowances and Reserves [Table Text Block]
   
Balance at
Beginning
of Period
    

Expense
(Recovery)
    


Deductions
    
Balance at
End of
Period
  
                                 
Year Ended December 31, 2018
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance for doubtful accounts
   $
213
     $
20
     $
-
     $
233
  
Warranty reserve
    
233
      
452
      
(339
)
    
346
  
                                 
Year Ended December 31, 2017
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance for doubtful accounts
   $
146
     $
68
     $
(1
)
   $
213
  
Warranty reserve
    
125
      
209
      
(101
)
    
233