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Note 6 - Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
As of June 30,
   
As of December 31,
 
(in thousands)
 
2020
   
2019
 
Finished goods
  $
353
    $
434
 
Raw materials
   
221
     
244
 
Work-in-process
   
497
     
953
 
Total inventories
  $
1,071
    $
1,631