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Note 8 - Restructuring Charges (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Restructuring and Related Costs [Table Text Block]
   
Three Months 
Ended
September
30, 
2019
   
Nine
Months 
Ended
September
30, 
2019
 
Beginning balance
  $
    $
244
 
Restructuring charges
   
     
92
 
Cash payments
   
     
(336
)
Ending balance
  $
    $