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Note 14 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
FISCAL YEAR
 
AMOUNT
 
   
(in thousands)
 
201
8
  $
16,719
 
201
9
   
13,300
 
20
20
   
8,489
 
20
21
   
5,314
 
202
2
   
3,117
 
Thereafter
   
15,500