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Note 3 - Inventories
12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Inventory Disclosure [Text Block]
3.
Inventories
 
Inventories consist of finished goods, raw materials and work in process and are stated at the lower of cost or market and consist of the following (in thousands):
 
   
As
of December 31,
 
   
201
7
   
201
6
 
Raw materials
  $
702
    $
1,126
 
Work-in-process
   
254
     
296
 
Finished goods
   
     
732
 
Inventories
  $
956
    $
2,154
 
 
The Company periodically evaluates the carrying value of inventory on hand for potential excess amount over demand using the same lower of cost or market approach as that used to value the inventory.
During the year ended
December 31, 2017,
the Company recorded an inventory impairment charge of
$0.4
million, primarily for ZALVISO raw materials inventory on hand, plus related purchase commitments.