Note 4 - Inventory (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
(In thousands)
  
March 31, 20
20
    
December 31, 201
9
  
Raw materials
   $
3,282
     $
2,979
  
Work in progress
    
1,658
      
1,896
  
Finished goods
    
5,889
      
6,097
  
Total
   $
10,829
     $
10,972