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Note 9 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Operating Leases of Lessee Disclosure [Table Text Block]
(in thousands)
 
2017
   
2018
   
2019
   
2020
   
2021
   
Thereafter
   
Total
 
Non-cancelable operating leases
  $
3,051
    $
2,527
    $
2,237
    $
2,259
    $
2,299
    $
8,695
    $
21,068