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Note 20 - Restructuring (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Restructuring and Related Costs [Table Text Block]
(in thousands)
  
Severance
  
Balance at December 31, 2016
   $
—
  
Charge for restructuring
    
182
  
Payments during 2017
    
(108
)
Balance at December 31, 2017
    
74
  
Payments during 2018
    
(70
)
Balance at December 31, 2018
   $
4