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Note 6 - Inventory (Tables)
3 Months Ended
Jul. 31, 2023
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

July 31, 2023

  

April 30, 2023

 

Parts and raw material

 $5,683  $5,704 

Work in process

  3,305   3,194 

Finished goods

  59   49 

Total Inventory, net of allowance

 $9,047  $8,947