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Note 6 - Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
20
20
   
December 31,
201
9
 
Raw materials
  $
5,471
    $
5,369
 
Work in process
   
1,109
     
949
 
Inventory consigned to others
   
46
     
54
 
Finished goods
   
1,094
     
810
 
Total inventories
  $
7,720
    $
7,182