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Note 3 - Inventories (Tables)
6 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September
3
0
,
20
20
   
March 31,
20
20
 
   
(in thousands)
 
Raw materials
  $
689
    $
397
 
Work in process
   
4,344
     
4,172
 
Finished goods
   
4,878
     
4,945
 
Supplies
   
163
     
139
 
Inventories, net
  $
10,074
    $
9,653