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Note 12 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
(in thousands)
 
2019
   
2020
   
2021
   
2022
   
2023
   
Thereafter
   
Total
 
Lease payments
  $
6,155
    $
5,405
    $
4,681
    $
3,706
    $
2,858
    $
5,057
    $
27,862