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Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Apr. 30, 2022
Apr. 30, 2021
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents $ 7,885 $ 83,028
Checking and Savings Accounts [Member]    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents 1,815 1,850
Money Market Funds [Member]    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents $ 6,070 $ 81,178