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Note 4 - Inventories
12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Inventory Disclosure [Text Block]
(
4
)
Inventories
 
Inventories consist of the following (in thousands):
 
    December 31,
    2017   2016
Raw materials   $
6,898
    $
7,111
 
Work in process    
1,207
     
1,354
 
Finished goods    
4,758
     
5,686
 
Total Inventory   $
12,863
    $
14,151