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Note 5 - Inventory, Net (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
(in thousands)
 
September 30, 2019
   
December 31, 2018
 
Raw materials
  $
8,347
    $
6,169
 
Work in progress
   
71
     
190
 
Finished goods
   
1,382
     
1,408
 
Inventory, net
  $
9,800
    $
7,767