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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

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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