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Note 3 - Inventories (Tables)
3 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June
3
0
,
201
9
   
March 31,
201
9
 
   
(in thousands)
 
Raw materials
  $
408
    $
495
 
Work in process
   
2,799
     
4,032
 
Finished goods
   
8,195
     
6,587
 
Supplies
   
168
     
160
 
Inventories, net
  $
11,570
    $
11,274