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Note 5 - Inventory, Net (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
(in thousands)
 
March 31
,
201
9
   
December 31,
201
8
 
Raw materials
  $
7,678
    $
6,169
 
Work in progress
   
189
     
190
 
Finished goods
   
2,077
     
1,408
 
Inventory, net
  $
9,944
    $
7,767