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Note 10 - Restructuring Charges (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Restructuring and Related Costs [Table Text Block]
   
Year Ended December 31,
 
   
2019
   
2018
 
Beginning balance
  $
244
    $
 
Restructuring charges
   
92
     
576
 
Cash payments
   
(336
)    
(332
)
Ending balance
  $
    $
244