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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
201
9
   
201
8
 
Raw materials
  $
1,426
    $
1,162
 
Work-in-process
   
596
     
158
 
Finished products
   
1,890
     
2,102
 
Total inventories
  $
3,912
    $
3,422