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Note 6 - Inventories
3 Months Ended
Mar. 31, 2018
Notes to Financial Statements  
Inventory Disclosure [Text Block]
(
6
)
Inventories
 
Inventories are stated at the lower of cost (
first
-in,
first
-out) or net realizable value, and consist of the following at the stated dates (in thousands):
 
    March 31,
2018
  December 31,
2017
 
Raw materials   $
8,761
    $
6,898
   
Work in process    
3,331
     
1,207
   
Finished goods    
6,166
     
4,758
   
Total inventory   $
18,258
    $
12,863