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Note 6 - Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
As of March 31,
   
As of December 31,
 
(in thousands)
 
2021
   
2020
 
Finished goods
  $
258
    $
255
 
Raw materials
   
186
     
217
 
Work-in-process
   
530
     
651
 
Total inventories
  $
974
    $
1,123