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Note 12 - Restructuring Charges (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Restructuring and Related Costs [Table Text Block]
   
Total
Restructuring
Charge
   
 
Costs Incurred
in 2016
   
 
Costs Incurred
in 2017
   
 
Balance at
Dec. 31, 2017
 
   
(in thousands)
 
Workforce Reduction
  $
10,652
    $
1,451
    $
6,633
    $
2,568
 
Asset Impairment
   
11,319
     
8,019
     
3,300
     
0
 
Lease Exit Costs
   
5,116
     
27
     
5,089
     
0