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Note 4 - Inventory, Net (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
(in thousands)
 
September 30
,
201
8
   
December 31,
201
7
 
Raw materials
  $
5,142
    $
6,927
 
Work in progress
   
252
     
179
 
Finished goods
   
720
     
31
 
Inventory, net
  $
6,114
    $
7,137