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Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Jul. 31, 2021
Apr. 30, 2021
Restricted Cash and Cash Equivalents Items [Line Items]    
Cash and cash equivalents $ 77,720 $ 83,028
Checking and Savings Accounts [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Cash and cash equivalents 1,022 1,850
Money Market Funds [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Cash and cash equivalents $ 76,698 $ 81,178