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Note 3 - Inventory (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
(I
n thousands)
 
March 31,
2019
   
December 31,
2018
 
Raw materials
  $
1,629
    $
1,453
 
Work in progress
   
949
     
652
 
Finished goods
   
1,482
     
1,404
 
Total
  $
4,060
    $
3,509