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Note 4 - Inventory (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
(In thousands)
 
June 30,
2019
   
December 31,
2018
 
Raw materials
  $
2,068
    $
1,453
 
Work in progress
   
275
     
652
 
Finished goods
   
2,963
     
1,404
 
Total
  $
5,306
    $
3,509