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Note 6 - Inventory, Net
 12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Inventory Disclosure [Text Block]
6.
Inventory, net
 
Inventory consisted of the following as of:
 
   
December 31,
  
(in thousands)
  
2019
    
2018
  
Raw materials
   $
9,132
     $
6,169
  
Work in progress
    
—
      
190
  
Finished goods    
1,964
      
1,408
  
Inventory
   $
11,096
     $
7,767