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Note 11 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Lessee, Operating Lease, Disclosure [Table Text Block]
(In thousands)
 
As of December 31,
2017
 
2018
  $
934
 
2019
   
837
 
2020
   
474
 
2021
   
397
 
2022
   
392
 
Thereafter
   
 
Total
  $
3,034