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Note 7 - Restructuring Charges (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Restructuring and Related Costs [Table Text Block]
   
Three Months Ended March 31,
 
   
2020
   
2019
 
Beginning balance
  $
    $
244
 
Restructuring charges
   
     
92
 
Cash payments
   
     
(245
)
Ending balance
  $
    $
91