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Note 11 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
(in thousands)
 
2017
 
 
2018
 
 
2019
 
 
2020
 
 
2021
 
 
Thereafter
 
 
Total
 
Lease payments
  $
6,634
    $
5,804
    $
4,511
    $
3,661
    $
2,574
    $
3,282
    $
26,466