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Account Receivable, Contract Assets, and Contract Liabilities (Tables)
12 Months Ended
Apr. 30, 2020
Account Receivable Contract Assets And Contract Liabilities  
Schedule of Accounts Receivable

Accounts receivable consisted of the following at April 30, 2020 and 2019.

 

    April 30, 2020     April 30, 2019  
    (in thousands)  
             
Opening balance   $ 63     $ 171  
Amount invoiced to customers     1,386       857  
Collections     (1,344 )     (965 )
Ending balance   $ 105     $ 63