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Note 3 - Inventories (Tables)
12 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
20
20
   
201
9
 
   
(in thousands)
 
Raw materials
  $
397
    $
495
 
Work in process
   
4,172
     
4,032
 
Finished goods
   
4,945
     
6,587
 
Supplies
   
139
     
160
 
Inventories, net
  $
9,653
    $
11,274