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Right-of-Use Assets and Lease Liabilities (Details) - Lessee, Operating Lease, Liability, Maturity - USD ($)
$ in Thousands
Apr. 30, 2020
Apr. 30, 2019
Lessee, Operating Lease, Liability, Maturity [Abstract]    
2021 $ 1,919  
2022 1,783  
2023 1,801  
2024 1,834  
2025 1,723  
Thereafter 5,492  
Total lease payments 14,552  
Less imputed interest (3,239)  
Present value of future lease payments 11,313  
Less current obligations under leases (1,869) $ 0
Long-term lease obligations $ 9,444 $ 0