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Property and Equipment (Tables)
12 Months Ended
Apr. 30, 2023
Property, Plant and Equipment [Abstract]  
Schedule of Components of Property and Equipment

The components of property and equipment as of April 30, 2023 and 2022 consisted of the following:

  

   April 30, 2023   April 30, 2022 
   (in thousands) 
Equipment  $783   $615 
Computer equipment & software   700    571 
Office furniture & equipment   386    352 
Leasehold improvements   611    477 
Leased WAM-V’s   371     
Construction in process       15 
 Property and equipment, gross   $2,851   $2,030 
Less: accumulated depreciation   (1,571)   (1,585)
Property and equipment, net  $1,280   $445