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Note 3 - Inventories (Tables)
9 Months Ended
Dec. 31, 2024
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

December 31,

2024

   

March 31,

2024

 
   

(in thousands)

 

Raw materials

  $ 798     $ 1,149  

Work in process

    2,566       2,195  

Finished goods

    4,097       3,658  

Supplies

    290       311  

Inventories

  $ 7,751     $ 7,313