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Note 4 - Inventories (Tables)
3 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
(In thousands)
 
June
30
,
201
8
   
March
31
,
201
8
 
Raw materials
  $
1,147
    $
2,290
 
Work-in-progress
   
1,749
     
2,100
 
Finished goods
   
81
     
561
 
Demonstration inventory
   
461
     
536
 
Total
  $
3,438
    $
5,487