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Note 3 - Inventories (Tables)
6 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

September 30,

2022

  

March 31,

2022

 
  

(in thousands)

 

Raw materials

 $1,843  $1,490 

Work in process

  4,461   2,868 

Finished goods

  5,349   4,595 

Supplies

  435   513 

Inventories

 $12,088  $9,466