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Note 7 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
201
7
   
201
6
 
Balance, January 1
  $
172
    $
192
 
Provision (reversal) for warranties issued
   
84
     
39
 
Settlements made
   
(107
)    
(59
)
Balance, December 31
  $
149
    $
172