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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Jul. 31, 2020
Apr. 30, 2020
Assets    
Right of use assets $ 1,920 $ 2,053
Liabilities    
Current lease liabilities 782 763
Long-term lease liabilities 1,265 $ 1,424
Total liabilities $ 2,047