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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance for doubtful accounts
   $
146
     $
68
     $
(1
 )   $
213
  
Warranty reserve
    
125
      
209
      
(101
 )    
233
  
                                 
Year Ended December 31, 2016
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance for doubtful accounts
   $
146
     $
-
     $
-
     $
146
  
Warranty reserve
    
94
      
125
      
(94
 )    
125