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Leases - Balance Sheet Information (Details) - USD ($)
$ in Thousands
Apr. 30, 2022
Apr. 30, 2021
ASSETS    
Lease right of use assets $ 935 $ 1,454
Liabilities [Abstract]    
Current lease liabilities 541 739
Long-term lease liabilities 461 821
Total liabilities $ 1,002 $ 1,560
Weighted average remaining lease term 1 year 10 months 24 days 2 years 4 months 24 days
Weighted average discount rate 3.20% 3.30%