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Note 3 - Inventories (Tables)
9 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

December 31,

2021

  

March 31,

2021

 
  

(in thousands)

 

Raw materials

 $1,399  $547 

Work in process

  3,273   3,206 

Finished goods

  3,743   4,423 

Supplies

  309   239 

Inventories

 $8,724  $8,415