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Note 6 - Inventories
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Inventory Disclosure [Text Block]
(
6
)
Inventories
 
Inventories are stated at the lower of cost (determined using the
first
-in,
first
-out method ) or net realizable value, and consist of the following at the stated dates (in thousands):
 
    March 31,
2019
  December
31, 2018
Raw materials   $
10,432
    $
11,727
 
Work in process    
2,618
     
2,521
 
Finished goods    
6,387
     
5,328
 
Total inventory   $
19,437
    $
19,576