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Accrued Expenses (Tables)
3 Months Ended
Jul. 31, 2021
Payables and Accruals [Abstract]  
Schedule of Accrued Expenses

Accrued expenses consisted of the following at July 31, 2021 and April 30, 2021:

 Schedule of Accrued Expenses

   July 31, 2021   April 30, 2021 
   (in thousands)     
Project costs  $198   $368 
Contract loss reserve   328    328 
Employee incentive payments   323    283 
Accrued salary and benefits   598    631 
Legal and accounting fees   292    200 
Other   82    71 
 Accrued expenses total  $1,821   $1,881