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Note 6 - Inventory, Net (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
(in thousands)
 
March 31, 2020
   
December 31, 2019
 
Raw materials
  $
8,904
    $
9,132
 
Finished goods
   
1,950
     
1,964
 
Inventory, net
  $
10,854
    $
11,096