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Note 3 - Inventories (Tables)
9 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
Dec
ember
3
1
,
2019
   
March 31,
2019
 
   
(in thousands)
 
Raw materials
  $
422
    $
495
 
Work in process
   
2,427
     
4,032
 
Finished goods
   
8,199
     
6,587
 
Supplies
   
158
     
160
 
Inventories, net
  $
11,206
    $
11,274