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Note 5 - Inventories (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

March 31, 2021

  

March 31, 2020

 

Raw materials

 $5,755  $4,738 

Work in process

  426   329 

Finished goods

  4,997   9,163 

Inventories, net

 $11,178  $14,230