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Summary of Significant Accounting Policies - Cash Equivalents Table (Details) - USD ($)
$ in Thousands
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Accounting Policies [Abstract]      
Cash and cash equivalents $ 8,078 $ 4,433  
Restricted cash 5,737 2,461  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 13,815 $ 6,894 $ 5,731