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Note 5 - Inventories
3 Months Ended
Mar. 31, 2020
Notes to Financial Statements  
Inventory Disclosure [Text Block]
5.
Inventories
Inventories consist of the following:
 
    March 31,
2020
  December 31,
2019
    (in thousands)
Finished goods   $
5,280
    $
5,561
 
Work in process    
3,160
     
3,153
 
Raw materials    
14,703
     
13,347
 
Total   $
23,143
    $
22,061