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Note 3 - Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
(In thousands)
 
201
8
   
201
7
 
Raw materials
  $
1,453
    $
583
 
Work in progress
   
652
     
454
 
Finished goods
   
1,404
     
810
 
Total
  $
3,509
    $
1,847