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Note 9 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Lessee, Operating Lease, Disclosure [Table Text Block]
(In thousands)
 
As of December 31,
2018
 
2019
  $
1,482
 
2020
   
1,129
 
2021
   
1,031
 
2022
   
1,013
 
2023
   
605
 
Thereafter
   
3,307
 
Total
  $
8,567