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Note 13 - Restructuring (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Restructuring and Related Costs [Table Text Block]
(in thousands)
 
Severance
 
Balance at December 31, 2017
  $
74
 
Payments
   
(57
)
Balance at June 30, 2018
  $
17