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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
(In thousands)
 
2019
   
2018
 
Raw materials
  $
2,979
    $
1,453
 
Work in progress
   
1,896
     
652
 
Finished goods
   
6,097
     
1,404
 
Total
  $
10,972
    $
3,509