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Note 4 - Contingencies (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Nine
months
Ended
September 30,
2019
    
Year
Ended
December 31,
201
8
  
   
(unaudited)
          
Beginning balance
   $
365
     $
322
  
Cost of warranty claims
    
(13
)
    
(15
)
Accruals for product warranties
    
(11
)
    
58
  
Ending balance
   $
341
     $
365