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Note 8 - Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
201
8
   
December 31,
201
7
 
Raw materials
  $
4,644
    $
3,424
 
Work in process
   
1,179
     
791
 
Inventory consigned to others
   
75
     
64
 
Finished goods
   
770
     
687
 
Total inventories
  $
6,668
    $
4,966