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

Accrued expenses consist of the following at January 31, 2021 and April 30, 2020:

 

    January 31, 2021     April 30, 2020  
    (in thousands)  
             
Project costs   $ 95     $ 48  
Contract loss reserve     425       216  
Employee incentive payments     407       -  
Accrued salary and benefits     831       483  
Legal and accounting fees     403       283  
Accrued taxes payable     -       177  
Other     179       146  
    $ 2,340     $ 1,353