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Note 11 - Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
(in thousands)
  
201
8
    
201
9
    
202
0
    
202
1
    
202
2
    
Thereafte
r
    
Tota
l
  
Lease payments
   $
6,385
     $
5,482
     $
4,774
     $
3,775
     $
2,871
     $
3,453
     $
26,740