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Note 5 - Inventory, Net (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
(in thousands)
 
2018
   
2017
 
Raw materials
  $
6,169
    $
6,927
 
Work in progress
   
190
     
179
 
Finished goods
   
1,408
     
31
 
Inventory
  $
7,767
    $
7,137